| | | | | | | | | | | | | | | | | | | | | |
<?xml version="1.0" standalone="no" encoding="windows-1252"?> |
<!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 5.12a --> |
<!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com --> |
<!-- Field: Doc-Info; Name: Status; Value: 0x00000000 --> |
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"> |
| <link:roleRef roleURI="http://oncocyte.com/role/Cover" xlink:href="ocx-20211231.xsd#Cover" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BalanceSheets" xlink:href="ocx-20211231.xsd#BalanceSheets" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BalanceSheetsParenthetical" xlink:href="ocx-20211231.xsd#BalanceSheetsParenthetical" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/StatementsOfOperations" xlink:href="ocx-20211231.xsd#StatementsOfOperations" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/StatementsOfComprehensiveLoss" xlink:href="ocx-20211231.xsd#StatementsOfComprehensiveLoss" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/StatementsOfShareholdersEquity" xlink:href="ocx-20211231.xsd#StatementsOfShareholdersEquity" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/StatementsOfCashFlows" xlink:href="ocx-20211231.xsd#StatementsOfCashFlows" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/OrganizationDescriptionOfBusinessAndLiquidity" xlink:href="ocx-20211231.xsd#OrganizationDescriptionOfBusinessAndLiquidity" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies" xlink:href="ocx-20211231.xsd#BasisOfPresentationAndSummaryOfSignificantAccountingPolicies" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BusinessCombinations" xlink:href="ocx-20211231.xsd#BusinessCombinations" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/GoodwillAndIntangibleAssetsNet" xlink:href="ocx-20211231.xsd#GoodwillAndIntangibleAssetsNet" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ShareholdersEquity" xlink:href="ocx-20211231.xsd#ShareholdersEquity" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/Stock-basedCompensation" xlink:href="ocx-20211231.xsd#Stock-basedCompensation" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/DisaggregationOfRevenuesAndConcentrationRisk" xlink:href="ocx-20211231.xsd#DisaggregationOfRevenuesAndConcentrationRisk" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/IncomeTaxes" xlink:href="ocx-20211231.xsd#IncomeTaxes" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgress" xlink:href="ocx-20211231.xsd#Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgress" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/CommitmentsAndContingencies" xlink:href="ocx-20211231.xsd#CommitmentsAndContingencies" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/RelatedPartyTransactions" xlink:href="ocx-20211231.xsd#RelatedPartyTransactions" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/LoanPayableToSiliconValleyBank" xlink:href="ocx-20211231.xsd#LoanPayableToSiliconValleyBank" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/QuarterlyFinancialData" xlink:href="ocx-20211231.xsd#QuarterlyFinancialData" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/SubsequentEvents" xlink:href="ocx-20211231.xsd#SubsequentEvents" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:href="ocx-20211231.xsd#BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables" xlink:href="ocx-20211231.xsd#BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BusinessCombinationsTables" xlink:href="ocx-20211231.xsd#BusinessCombinationsTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/GoodwillAndIntangibleAssetsNetTables" xlink:href="ocx-20211231.xsd#GoodwillAndIntangibleAssetsNetTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/Stock-basedCompensationTables" xlink:href="ocx-20211231.xsd#Stock-basedCompensationTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/DisaggregationOfRevenuesAndConcentrationRiskTables" xlink:href="ocx-20211231.xsd#DisaggregationOfRevenuesAndConcentrationRiskTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/IncomeTaxesTables" xlink:href="ocx-20211231.xsd#IncomeTaxesTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressTables" xlink:href="ocx-20211231.xsd#Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/CommitmentsAndContingenciesTables" xlink:href="ocx-20211231.xsd#CommitmentsAndContingenciesTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/QuarterlyFinancialDataTables" xlink:href="ocx-20211231.xsd#QuarterlyFinancialDataTables" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/OrganizationDescriptionOfBusinessAndLiquidityDetailsNarrative" xlink:href="ocx-20211231.xsd#OrganizationDescriptionOfBusinessAndLiquidityDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfPrepaidExpensesAndOtherCurrentAssetsDetails" xlink:href="ocx-20211231.xsd#ScheduleOfPrepaidExpensesAndOtherCurrentAssetsDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetails" xlink:href="ocx-20211231.xsd#ScheduleOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfCommonStockEquivalentsExcludedFromComputationOfDilutedNetLossPerShareOfCommonStockDetails" xlink:href="ocx-20211231.xsd#ScheduleOfCommonStockEquivalentsExcludedFromComputationOfDilutedNetLossPerShareOfCommonStockDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:href="ocx-20211231.xsd#BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfFairValueOfAggregateMergerConsiderationDetails" xlink:href="ocx-20211231.xsd#ScheduleOfFairValueOfAggregateMergerConsiderationDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfFairValueOfAggregateMergerConsiderationDetailsParenthetical" xlink:href="ocx-20211231.xsd#ScheduleOfFairValueOfAggregateMergerConsiderationDetailsParenthetical" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfIntangibleAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:href="ocx-20211231.xsd#ScheduleOfIntangibleAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfIdentifiableIntangibleAssetsAndEstimatedUsefulLifeDetails" xlink:href="ocx-20211231.xsd#ScheduleOfIdentifiableIntangibleAssetsAndEstimatedUsefulLifeDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfFairValueOfContingentConsiderationLiabilityDetails" xlink:href="ocx-20211231.xsd#ScheduleOfFairValueOfContingentConsiderationLiabilityDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfContingentConsiderationMeasuredAtFairValueDetails" xlink:href="ocx-20211231.xsd#ScheduleOfContingentConsiderationMeasuredAtFairValueDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfAcquisitionIntangibleAssetsDetails" xlink:href="ocx-20211231.xsd#ScheduleOfAcquisitionIntangibleAssetsDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/SummaryOfAcquisitionIntangibleAssetsDetailsParenthetical" xlink:href="ocx-20211231.xsd#SummaryOfAcquisitionIntangibleAssetsDetailsParenthetical" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfCondensedStatementOfOperationsDetails" xlink:href="ocx-20211231.xsd#ScheduleOfCondensedStatementOfOperationsDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/BusinessCombinationsDetailsNarrative" xlink:href="ocx-20211231.xsd#BusinessCombinationsDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfGoodwillAndIntangibleAssetsDetails" xlink:href="ocx-20211231.xsd#ScheduleOfGoodwillAndIntangibleAssetsDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfIntangibleAssetsFutureAmortizationExpenseDetails" xlink:href="ocx-20211231.xsd#ScheduleOfIntangibleAssetsFutureAmortizationExpenseDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ShareholdersEquityDetailsNarrative" xlink:href="ocx-20211231.xsd#ShareholdersEquityDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/SummaryOfStockOptionActivityDetails" xlink:href="ocx-20211231.xsd#SummaryOfStockOptionActivityDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfStockOptionsOutstandingVestedAndExercisableDetails" xlink:href="ocx-20211231.xsd#ScheduleOfStockOptionsOutstandingVestedAndExercisableDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/SummaryOfStock-basedCompensationExpenseDetails" xlink:href="ocx-20211231.xsd#SummaryOfStock-basedCompensationExpenseDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfAssumptionsUsedToCalculateFairValueOfStockOptionsDetails" xlink:href="ocx-20211231.xsd#ScheduleOfAssumptionsUsedToCalculateFairValueOfStockOptionsDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/Stock-basedCompensationDetailsNarrative" xlink:href="ocx-20211231.xsd#Stock-basedCompensationDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfConsolidatedRevenuesAttributableToProductsOrServicesDetails" xlink:href="ocx-20211231.xsd#ScheduleOfConsolidatedRevenuesAttributableToProductsOrServicesDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfConsolidatedRevenuesGeneratedByUnaffiliatedCustomersDetails" xlink:href="ocx-20211231.xsd#ScheduleOfConsolidatedRevenuesGeneratedByUnaffiliatedCustomersDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfPercentageOfConsolidatedRevenuesAttributableToGeographicalLocationsDetails" xlink:href="ocx-20211231.xsd#ScheduleOfPercentageOfConsolidatedRevenuesAttributableToGeographicalLocationsDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfPercentageOfTotalConsolidatedAccountsReceivablesDetails" xlink:href="ocx-20211231.xsd#ScheduleOfPercentageOfTotalConsolidatedAccountsReceivablesDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="ocx-20211231.xsd#ScheduleOfComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfIncomeTaxReconciliationDetails" xlink:href="ocx-20211231.xsd#ScheduleOfIncomeTaxReconciliationDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfUnrecognizedTaxBenefitDetails" xlink:href="ocx-20211231.xsd#ScheduleOfUnrecognizedTaxBenefitDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/IncomeTaxesDetailsNarrative" xlink:href="ocx-20211231.xsd#IncomeTaxesDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfRight-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressDetails" xlink:href="ocx-20211231.xsd#ScheduleOfRight-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressDetailsNarrative" xlink:href="ocx-20211231.xsd#Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfSupplementalCashFlowInformationRelatedToOperatingAndFinancingLeaseDetails" xlink:href="ocx-20211231.xsd#ScheduleOfSupplementalCashFlowInformationRelatedToOperatingAndFinancingLeaseDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfSupplementalBalanceSheetInformationRelatedToOperatingAndFinancingLeasesDetails" xlink:href="ocx-20211231.xsd#ScheduleOfSupplementalBalanceSheetInformationRelatedToOperatingAndFinancingLeasesDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfFutureMinimumLeaseCommitmentsForOperatingAndFinancingLeasesDetails" xlink:href="ocx-20211231.xsd#ScheduleOfFutureMinimumLeaseCommitmentsForOperatingAndFinancingLeasesDetails" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:href="ocx-20211231.xsd#CommitmentsAndContingenciesDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/RelatedPartyTransactionsDetailsNarrative" xlink:href="ocx-20211231.xsd#RelatedPartyTransactionsDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/LoanPayableToSiliconValleyBankDetailsNarrative" xlink:href="ocx-20211231.xsd#LoanPayableToSiliconValleyBankDetailsNarrative" xlink:type="simple"/> |
| <link:roleRef roleURI="http://oncocyte.com/role/ScheduleOfQuarterlyFinancialInformationDetails" xlink:href="ocx-20211231.xsd#ScheduleOfQuarterlyFinancialInformationDetails" xlink:type="simple"/> |
| <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"/> |
| <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"/> |
| <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"/> |
| <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all"/> |
| <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" arcroleURI="http://xbrl.org/int/dim/arcrole/notAll"/> |
| <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Cover" xlink:title="00000001 - Document - Cover"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BalanceSheets" xlink:title="00000002 - Statement - Consolidated Balance Sheets"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BalanceSheetsParenthetical" xlink:title="00000003 - Statement - Consolidated Balance Sheets (Parenthetical)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/StatementsOfOperations" xlink:title="00000004 - Statement - Consolidated Statements of Operations"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/StatementsOfComprehensiveLoss" xlink:title="00000005 - Statement - Consolidated Statements of Comprehensive Loss"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/StatementsOfShareholdersEquity" xlink:title="00000006 - Statement - Consolidated Statements of Shareholders' Equity"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaapCommonStockMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapCommonStockMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaapRetainedEarningsMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapRetainedEarningsMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaapStockholdersEquity_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockholdersEquity_50" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding" xlink:label="loc_us-gaapSharesOutstanding_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharesOutstanding_50" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaapNetIncomeLoss_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapNetIncomeLoss_50" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensationGross" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueShareBasedCompensationGross_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueShareBasedCompensationGross_50" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_50" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_50" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueOther" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueOther_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueOther_50" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodValueOfSaleOfCommonSharesUnderAtthemarketTransactions" xlink:label="loc_OCXStockIssuedDuringPeriodValueOfSaleOfCommonSharesUnderAtthemarketTransactions_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodValueOfSaleOfCommonSharesUnderAtthemarketTransactions_50" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodSharesSaleOfCommonSharesUnderAtthemarketTransactionsShares" xlink:label="loc_OCXStockIssuedDuringPeriodSharesSaleOfCommonSharesUnderAtthemarketTransactionsShares_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodSharesSaleOfCommonSharesUnderAtthemarketTransactionsShares_50" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodValueFinancingCostsForAtthemarketTransactions" xlink:label="loc_OCXStockIssuedDuringPeriodValueFinancingCostsForAtthemarketTransactions_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodValueFinancingCostsForAtthemarketTransactions_50" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueStockOptionsExercised_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueStockOptionsExercised_50" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesStockOptionsExercised_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesStockOptionsExercised_50" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodValueWarrantsExercised" xlink:label="loc_OCXStockIssuedDuringPeriodValueWarrantsExercised_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodValueWarrantsExercised_50" xlink:type="arc" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodSharesWarrantsExercised" xlink:label="loc_OCXStockIssuedDuringPeriodSharesWarrantsExercised_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodSharesWarrantsExercised_50" xlink:type="arc" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SharesIssuedUponVestingOfRsuNetOfSharesRetiredToPayEmployeesTaxes" xlink:label="loc_OCXSharesIssuedUponVestingOfRsuNetOfSharesRetiredToPayEmployeesTaxes_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXSharesIssuedUponVestingOfRsuNetOfSharesRetiredToPayEmployeesTaxes_50" xlink:type="arc" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SharesIssuedUponVestingOfRsuNetOfSharesRetiredToPayEmployeesTaxesShares" xlink:label="loc_OCXSharesIssuedUponVestingOfRsuNetOfSharesRetiredToPayEmployeesTaxesShares_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXSharesIssuedUponVestingOfRsuNetOfSharesRetiredToPayEmployeesTaxesShares_50" xlink:type="arc" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueIssuedForServices" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueIssuedForServices_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueIssuedForServices_50" xlink:type="arc" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesIssuedForServices" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesIssuedForServices_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesIssuedForServices_50" xlink:type="arc" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueAcquisitions_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueAcquisitions_50" xlink:type="arc" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesAcquisitions_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesAcquisitions_50" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodValueAcquisitionsOne" xlink:label="loc_OCXStockIssuedDuringPeriodValueAcquisitionsOne_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodValueAcquisitionsOne_50" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodSharesAcquisitionsOne" xlink:label="loc_OCXStockIssuedDuringPeriodSharesAcquisitionsOne_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodSharesAcquisitionsOne_50" xlink:type="arc" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodValueAcquisitionsTwo" xlink:label="loc_OCXStockIssuedDuringPeriodValueAcquisitionsTwo_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodValueAcquisitionsTwo_50" xlink:type="arc" order="23"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockIssuedDuringPeriodSharesAcquisitionsTwo" xlink:label="loc_OCXStockIssuedDuringPeriodSharesAcquisitionsTwo_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXStockIssuedDuringPeriodSharesAcquisitionsTwo_50" xlink:type="arc" order="24"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AdjustmentstoForeignCurrencyTranslation" xlink:label="loc_OCXAdjustmentstoForeignCurrencyTranslation_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXAdjustmentstoForeignCurrencyTranslation_50" xlink:type="arc" order="25"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/StatementsOfCashFlows" xlink:title="00000007 - Statement - Consolidated Statements of Cash Flows"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/OrganizationDescriptionOfBusinessAndLiquidity" xlink:title="00000008 - Disclosure - Organization, Description of the Business and Liquidity"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies" xlink:title="00000009 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BusinessCombinations" xlink:title="00000010 - Disclosure - Business Combinations"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/GoodwillAndIntangibleAssetsNet" xlink:title="00000011 - Disclosure - Goodwill and Intangible Assets, net"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ShareholdersEquity" xlink:title="00000012 - Disclosure - Shareholders’ Equity"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Stock-basedCompensation" xlink:title="00000013 - Disclosure - Stock-Based Compensation"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/DisaggregationOfRevenuesAndConcentrationRisk" xlink:title="00000014 - Disclosure - Disaggregation of Revenues and Concentration Risk"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/IncomeTaxes" xlink:title="00000015 - Disclosure - Income Taxes"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgress" xlink:title="00000016 - Disclosure - Right-of-use Assets, Machinery and Equipment, Net and Construction in Progress"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/CommitmentsAndContingencies" xlink:title="00000017 - Disclosure - Commitments and Contingencies"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/RelatedPartyTransactions" xlink:title="00000018 - Disclosure - Related Party Transactions"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/LoanPayableToSiliconValleyBank" xlink:title="00000019 - Disclosure - Loan Payable to Silicon Valley Bank"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/QuarterlyFinancialData" xlink:title="00000020 - Disclosure - Quarterly Financial Data (unaudited)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/SubsequentEvents" xlink:title="00000021 - Disclosure - Subsequent Events"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:title="00000022 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables" xlink:title="00000023 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BusinessCombinationsTables" xlink:title="00000024 - Disclosure - Business Combinations (Tables)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaapBusinessAcquisitionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_InsightMergerMember" xlink:label="loc_OCXInsightMergerMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXInsightMergerMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixBiomedicalIncMember" xlink:label="loc_OCXChronixBiomedicalIncMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXChronixBiomedicalIncMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixMergerMember" xlink:label="loc_OCXChronixMergerMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXChronixMergerMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ScheduleOfFairValueOfAggregateMergerConsiderationTableTextBlock" xlink:label="loc_OCXScheduleOfFairValueOfAggregateMergerConsiderationTableTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXScheduleOfFairValueOfAggregateMergerConsiderationTableTextBlock_50" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock" xlink:label="loc_us-gaapScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_50" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ScheduleOfIdentifiableIntangibleAssetsAndEstimatedUsefulLifeTableTextBlock" xlink:label="loc_OCXScheduleOfIdentifiableIntangibleAssetsAndEstimatedUsefulLifeTableTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXScheduleOfIdentifiableIntangibleAssetsAndEstimatedUsefulLifeTableTextBlock_50" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionContingentConsiderationTextBlock_50" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ScheduleOfContingentConsiderationMeasuredAtFairValueTableTextBlock" xlink:label="loc_OCXScheduleOfContingentConsiderationMeasuredAtFairValueTableTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXScheduleOfContingentConsiderationMeasuredAtFairValueTableTextBlock_50" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetAcquisitionTableTextBlock" xlink:label="loc_us-gaapAssetAcquisitionTableTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapAssetAcquisitionTableTextBlock_50" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScheduleOfCondensedIncomeStatementTableTextBlock" xlink:label="loc_srtScheduleOfCondensedIncomeStatementTableTextBlock_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_srtScheduleOfCondensedIncomeStatementTableTextBlock_50" xlink:type="arc" order="6"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/GoodwillAndIntangibleAssetsNetTables" xlink:title="00000025 - Disclosure - Goodwill and Intangible Assets, net (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Stock-basedCompensationTables" xlink:title="00000026 - Disclosure - Stock-Based Compensation (Tables)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_us-gaapPlanNameAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandTenPlanActivityMember" xlink:label="loc_OCXTwoThousandTenPlanActivityMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandTenPlanActivityMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandEighteenPalnActivityMember" xlink:label="loc_OCXTwoThousandEighteenPalnActivityMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandEighteenPalnActivityMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock" xlink:label="loc_us-gaapScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_40" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SchduleOfStockOptionsOutstandingVestedAndExercisableTableTextBlock" xlink:label="loc_OCXSchduleOfStockOptionsOutstandingVestedAndExercisableTableTextBlock_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXSchduleOfStockOptionsOutstandingVestedAndExercisableTableTextBlock_40" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock" xlink:label="loc_us-gaapScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_40" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock" xlink:label="loc_us-gaapScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_40" xlink:type="arc" order="3"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/DisaggregationOfRevenuesAndConcentrationRiskTables" xlink:title="00000027 - Disclosure - Disaggregation of Revenues and Concentration Risk (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/IncomeTaxesTables" xlink:title="00000028 - Disclosure - Income Taxes (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressTables" xlink:title="00000029 - Disclosure - Right-of-use Assets, Machinery and Equipment, Net and Construction in Progress (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/CommitmentsAndContingenciesTables" xlink:title="00000030 - Disclosure - Commitments and Contingencies (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/QuarterlyFinancialDataTables" xlink:title="00000031 - Disclosure - Quarterly Financial Data (unaudited) (Tables)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/OrganizationDescriptionOfBusinessAndLiquidityDetailsNarrative" xlink:title="00000032 - Disclosure - Organization, Description of the Business and Liquidity (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:label="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorGenomicsIncMember" xlink:label="loc_OCXRazorGenomicsIncMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXRazorGenomicsIncMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PiperSandlerAndCoMember" xlink:label="loc_OCXPiperSandlerAndCoMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXPiperSandlerAndCoMember_30" xlink:type="arc" order="32"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SiliconValleyBankMember" xlink:label="loc_OCXSiliconValleyBankMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXSiliconValleyBankMember_50" xlink:type="arc" order="52"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BTIGLLCMember" xlink:label="loc_OCXBTIGLLCMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXBTIGLLCMember_70" xlink:type="arc" order="72"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaapTypeOfArrangementAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapTypeOfArrangementAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ATMAgreementMember" xlink:label="loc_OCXATMAgreementMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXATMAgreementMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AtTheMarketSalesAgreementMember" xlink:label="loc_OCXAtTheMarketSalesAgreementMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXAtTheMarketSalesAgreementMember_70" xlink:type="arc" order="71"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaapDebtInstrumentAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapDebtInstrumentAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapDebtInstrumentAxis" xlink:to="loc_us-gaapDebtInstrumentNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaapDebtInstrumentNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapDebtInstrumentAxis" xlink:to="loc_us-gaapDebtInstrumentNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PaycheckProtectionProgramMember" xlink:label="loc_OCXPaycheckProtectionProgramMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDebtInstrumentNameDomain" xlink:to="loc_OCXPaycheckProtectionProgramMember_50" xlink:type="arc" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaapEquityMethodInvestmentOwnershipPercentage_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapEquityMethodInvestmentOwnershipPercentage_110" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaapPaymentsForRepurchaseOfCommonStock_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapPaymentsForRepurchaseOfCommonStock_110" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_110" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaapRetainedEarningsAccumulatedDeficit_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapRetainedEarningsAccumulatedDeficit_110" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue_110" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNi" xlink:label="loc_us-gaapEquitySecuritiesFvNi_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapEquitySecuritiesFvNi_110" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction" xlink:label="loc_us-gaapSaleOfStockConsiderationReceivedOnTransaction_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapSaleOfStockConsiderationReceivedOnTransaction_110" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaapAdditionalPaidInCapitalCommonStock_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapAdditionalPaidInCapitalCommonStock_110" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt" xlink:label="loc_us-gaapProceedsFromIssuanceOfLongTermDebt_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapProceedsFromIssuanceOfLongTermDebt_110" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaapDebtInstrumentInterestRateStatedPercentage_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapDebtInstrumentInterestRateStatedPercentage_110" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate" xlink:label="loc_us-gaapDebtInstrumentMaturityDate_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapDebtInstrumentMaturityDate_110" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_GainsOnExtinguishmentOfDebt" xlink:label="loc_OCXGainsOnExtinguishmentOfDebt_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXGainsOnExtinguishmentOfDebt_110" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction" xlink:label="loc_us-gaapSaleOfStockNumberOfSharesIssuedInTransaction_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapSaleOfStockNumberOfSharesIssuedInTransaction_110" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare" xlink:label="loc_us-gaapSaleOfStockPricePerShare_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapSaleOfStockPricePerShare_110" xlink:type="arc" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering" xlink:label="loc_us-gaapProceedsFromIssuanceInitialPublicOffering_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapProceedsFromIssuanceInitialPublicOffering_110" xlink:type="arc" order="14"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfPrepaidExpensesAndOtherCurrentAssetsDetails" xlink:title="00000033 - Disclosure - Schedule of Prepaid Expenses and Other Current Assets (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfReconciliationOfCashCashEquivalentsAndRestrictedCashDetails" xlink:title="00000034 - Disclosure - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfCommonStockEquivalentsExcludedFromComputationOfDilutedNetLossPerShareOfCommonStockDetails" xlink:title="00000035 - Disclosure - Schedule of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share of Common Stock (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaapScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="loc_us-gaapScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:to="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaapAntidilutiveSecuritiesNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaapAntidilutiveSecuritiesNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:to="loc_us-gaapAntidilutiveSecuritiesNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockOptionsMember" xlink:label="loc_OCXStockOptionsMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_OCXStockOptionsMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaapWarrantMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesNameDomain" xlink:to="loc_us-gaapWarrantMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:to="loc_us-gaapAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_50" xlink:type="arc" order="0"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesDetailsNarrative" xlink:title="00000036 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaapPropertyPlantAndEquipmentLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesAxis" xlink:label="loc_srtConsolidatedEntitiesAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_srtConsolidatedEntitiesAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srtConsolidatedEntitiesDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtConsolidatedEntitiesAxis" xlink:to="loc_srtConsolidatedEntitiesDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ConsolidatedEntitiesDomain" xlink:label="loc_srtConsolidatedEntitiesDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtConsolidatedEntitiesAxis" xlink:to="loc_srtConsolidatedEntitiesDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LineageMember" xlink:label="loc_OCXLineageMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtConsolidatedEntitiesDomain" xlink:to="loc_OCXLineageMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AgeXTherapeuticsIncMember" xlink:label="loc_OCXAgeXTherapeuticsIncMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtConsolidatedEntitiesDomain" xlink:to="loc_OCXAgeXTherapeuticsIncMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorGenomicsIncMember" xlink:label="loc_OCXRazorGenomicsIncMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXRazorGenomicsIncMember_50" xlink:type="arc" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorMember" xlink:label="loc_OCXRazorMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_OCXRazorMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_us-gaapParentMember_160"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapParentMember_160" xlink:type="arc" order="161"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MachineryAndEquipmentMember" xlink:label="loc_us-gaapMachineryAndEquipmentMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapMachineryAndEquipmentMember_70" xlink:type="arc" order="71"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquipmentMember" xlink:label="loc_us-gaapEquipmentMember_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_us-gaapEquipmentMember_90" xlink:type="arc" order="91"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srtRangeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_srtRangeAxis" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember" xlink:label="loc_srtMinimumMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMinimumMember_70" xlink:type="arc" order="72"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srtMaximumMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMaximumMember_80" xlink:type="arc" order="82"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaapCustomerRelationshipsMember_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="loc_us-gaapCustomerRelationshipsMember_110" xlink:type="arc" order="111"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaapIncomeStatementLocationAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfPropertyPlantAndEquipmentTable" xlink:to="loc_us-gaapIncomeStatementLocationAxis" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaapResearchAndDevelopmentExpenseMember_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_us-gaapResearchAndDevelopmentExpenseMember_120" xlink:type="arc" order="121"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaapCashAndCashEquivalentsAtCarryingValue_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapCashAndCashEquivalentsAtCarryingValue_180" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CommonStockSharesHeldAsAvailableForSaleSecurities" xlink:label="loc_OCXCommonStockSharesHeldAsAvailableForSaleSecurities_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_OCXCommonStockSharesHeldAsAvailableForSaleSecurities_180" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesFvNi" xlink:label="loc_us-gaapEquitySecuritiesFvNi_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapEquitySecuritiesFvNi_180" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetImpairment" xlink:label="loc_us-gaapGoodwillAndIntangibleAssetImpairment_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapGoodwillAndIntangibleAssetImpairment_180" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaapEquityMethodInvestmentOwnershipPercentage_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapEquityMethodInvestmentOwnershipPercentage_180" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaapPropertyPlantAndEquipmentUsefulLife_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentUsefulLife_180" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract" xlink:label="loc_us-gaapLesseeOperatingLeaseTermOfContract_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseTermOfContract_180" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetUsefulLife_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetUsefulLife_180" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf" xlink:label="loc_us-gaapImpairmentOfLongLivedAssetsToBeDisposedOf_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapImpairmentOfLongLivedAssetsToBeDisposedOf_180" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense" xlink:label="loc_us-gaapIncomeTaxExaminationPenaltiesAndInterestExpense_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapIncomeTaxExaminationPenaltiesAndInterestExpense_180" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableSale" xlink:label="loc_us-gaapAccountsReceivableSale_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentLineItems" xlink:to="loc_us-gaapAccountsReceivableSale_180" xlink:type="arc" order="10"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfFairValueOfAggregateMergerConsiderationDetails" xlink:title="00000037 - Disclosure - Schedule of Fair Value of Aggregate Merger Consideration (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaapBusinessAcquisitionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_InsightMergerAgreementsMember" xlink:label="loc_OCXInsightMergerAgreementsMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXInsightMergerAgreementsMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixBiomedicalIncMember" xlink:label="loc_OCXChronixBiomedicalIncMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXChronixBiomedicalIncMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAcquiredInExcessOfPaymentsToAcquireBusiness" xlink:label="loc_us-gaapCashAcquiredInExcessOfPaymentsToAcquireBusiness_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapCashAcquiredInExcessOfPaymentsToAcquireBusiness_50" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="loc_us-gaapBusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_50" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfPerShare" xlink:label="loc_OCXBusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfPerShare_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXBusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfPerShare_50" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned" xlink:label="loc_us-gaapBusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_50" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BusinessCombinationContingentConsiderationArrangementsBasisForAmounts" xlink:label="loc_OCXBusinessCombinationContingentConsiderationArrangementsBasisForAmounts_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXBusinessCombinationContingentConsiderationArrangementsBasisForAmounts_50" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FairValueOfConsiderationTransferredOnMergerDate" xlink:label="loc_OCXFairValueOfConsiderationTransferredOnMergerDate_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXFairValueOfConsiderationTransferredOnMergerDate_50" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BusinessCombinationAcquireeActivityPreCombinationNet" xlink:label="loc_OCXBusinessCombinationAcquireeActivityPreCombinationNet_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXBusinessCombinationAcquireeActivityPreCombinationNet_50" xlink:type="arc" order="6"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfFairValueOfAggregateMergerConsiderationDetailsParenthetical" xlink:title="00000038 - Disclosure - Schedule of Fair Value of Aggregate Merger Consideration (Details) (Parenthetical)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaapBusinessAcquisitionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CashHoldbackMember" xlink:label="loc_OCXCashHoldbackMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXCashHoldbackMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockHoldbackMember" xlink:label="loc_OCXStockHoldbackMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXStockHoldbackMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PaymentsOfCashConsideration" xlink:label="loc_OCXPaymentsOfCashConsideration_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXPaymentsOfCashConsideration_40" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_EscrowAccountDepositShares" xlink:label="loc_OCXEscrowAccountDepositShares_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXEscrowAccountDepositShares_40" xlink:type="arc" order="1"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfIntangibleAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:title="00000039 - Disclosure - Schedule of Intangible Assets Acquired and Liabilities Assumed (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfIdentifiableIntangibleAssetsAndEstimatedUsefulLifeDetails" xlink:title="00000040 - Disclosure - Schedule of Identifiable Intangible Assets and Estimated Useful Life (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaapAcquiredIndefiniteLivedIntangibleAssetsLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InProcessResearchAndDevelopmentMember" xlink:label="loc_us-gaapInProcessResearchAndDevelopmentMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="loc_us-gaapInProcessResearchAndDevelopmentMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaapCustomerRelationshipsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIndefiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="loc_us-gaapCustomerRelationshipsMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FiniteLivedIntangibleAssetEstimatedFairValue" xlink:label="loc_OCXFiniteLivedIntangibleAssetEstimatedFairValue_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:to="loc_OCXFiniteLivedIntangibleAssetEstimatedFairValue_40" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetUsefulLife_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAcquiredIndefiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetUsefulLife_40" xlink:type="arc" order="1"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfFairValueOfContingentConsiderationLiabilityDetails" xlink:title="00000041 - Disclosure - Schedule of Fair Value of Contingent Consideration Liability (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaapBusinessAcquisitionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MilestoneOneMember" xlink:label="loc_OCXMilestoneOneMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXMilestoneOneMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MilestoneTwoMember" xlink:label="loc_OCXMilestoneTwoMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXMilestoneTwoMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MilestoneThreeMember" xlink:label="loc_OCXMilestoneThreeMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXMilestoneThreeMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RoyaltyOneMember" xlink:label="loc_OCXRoyaltyOneMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXRoyaltyOneMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RoyaltyTwoMember" xlink:label="loc_OCXRoyaltyTwoMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXRoyaltyTwoMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ContingentConsiderationLiabilityContractualValue" xlink:label="loc_OCXContingentConsiderationLiabilityContractualValue_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXContingentConsiderationLiabilityContractualValue_70" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaapBusinessCombinationContingentConsiderationLiability_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessCombinationContingentConsiderationLiability_70" xlink:type="arc" order="1"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfContingentConsiderationMeasuredAtFairValueDetails" xlink:title="00000042 - Disclosure - Schedule of Contingent Consideration, Measured at Fair Value (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaapBusinessAcquisitionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaapFairValueByFairValueHierarchyLevelAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFairValueByFairValueHierarchyLevelAxis" xlink:to="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaapFairValueInputsLevel3Member_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFairValueMeasurementsFairValueHierarchyDomain" xlink:to="loc_us-gaapFairValueInputsLevel3Member_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_InsightMergerMember" xlink:label="loc_OCXInsightMergerMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXInsightMergerMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixMergerMember" xlink:label="loc_OCXChronixMergerMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXChronixMergerMember_50" xlink:type="arc" order="52"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaapBusinessCombinationContingentConsiderationLiability_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessCombinationContingentConsiderationLiability_90" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1" xlink:label="loc_us-gaapBusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_90" xlink:type="arc" order="1"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfAcquisitionIntangibleAssetsDetails" xlink:title="00000043 - Disclosure - Schedule of Acquisition Intangible Assets (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorGenomicsIncMember" xlink:label="loc_OCXRazorGenomicsIncMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXRazorGenomicsIncMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaapEquityMethodInvestments_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapEquityMethodInvestments_20" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CashPaidAsAdditionalPurchasePaymentForRazorAsset" xlink:label="loc_OCXCashPaidAsAdditionalPurchasePaymentForRazorAsset_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXCashPaidAsAdditionalPurchasePaymentForRazorAsset_20" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockValue_20" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CashBalanceReceivedFromRazorForClinicalTrialExpenses" xlink:label="loc_OCXCashBalanceReceivedFromRazorForClinicalTrialExpenses_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXCashBalanceReceivedFromRazorForClinicalTrialExpenses_20" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaapDeferredTaxLiabilities_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapDeferredTaxLiabilities_20" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherFiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaapOtherFiniteLivedIntangibleAssetsGross_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapOtherFiniteLivedIntangibleAssetsGross_20" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsGross_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsGross_20" xlink:type="arc" order="6"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/SummaryOfAcquisitionIntangibleAssetsDetailsParenthetical" xlink:title="00000044 - Disclosure - Summary of Acquisition Intangible Assets (Details) (Parenthetical)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorGenomicsIncMember" xlink:label="loc_OCXRazorGenomicsIncMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXRazorGenomicsIncMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_20" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RemainingUsefulLifeOfAsset" xlink:label="loc_OCXRemainingUsefulLifeOfAsset_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXRemainingUsefulLifeOfAsset_20" xlink:type="arc" order="1"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfCondensedStatementOfOperationsDetails" xlink:title="00000045 - Disclosure - Schedule of Condensed Statement of Operations (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/BusinessCombinationsDetailsNarrative" xlink:title="00000046 - Disclosure - Business Combinations (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaapBusinessAcquisitionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaapTypeOfArrangementAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapTypeOfArrangementAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_InsightMergerAgreementsMember" xlink:label="loc_OCXInsightMergerAgreementsMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXInsightMergerAgreementsMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MergerAgreementsMember" xlink:label="loc_OCXMergerAgreementsMember_140"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXMergerAgreementsMember_140" xlink:type="arc" order="141"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MinorityPurchaseAgreementsMember" xlink:label="loc_OCXMinorityPurchaseAgreementsMember_180"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXMinorityPurchaseAgreementsMember_180" xlink:type="arc" order="181"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AdditionalPurchasePaymentMember" xlink:label="loc_OCXAdditionalPurchasePaymentMember_190"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXAdditionalPurchasePaymentMember_190" xlink:type="arc" order="191"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DevelopmentAgreementMember" xlink:label="loc_OCXDevelopmentAgreementMember_210"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXDevelopmentAgreementMember_210" xlink:type="arc" order="211"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LaboratoryAgreementMember" xlink:label="loc_OCXLaboratoryAgreementMember_260"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXLaboratoryAgreementMember_260" xlink:type="arc" order="261"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixMergerAgreementMember" xlink:label="loc_OCXChronixMergerAgreementMember_320"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXChronixMergerAgreementMember_320" xlink:type="arc" order="321"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MergerAgreementMember" xlink:label="loc_OCXMergerAgreementMember_340"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXMergerAgreementMember_340" xlink:type="arc" order="342"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CashHoldbackMember" xlink:label="loc_OCXCashHoldbackMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXCashHoldbackMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockHoldbackMember" xlink:label="loc_OCXStockHoldbackMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXStockHoldbackMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockHoldbackOneMember" xlink:label="loc_OCXStockHoldbackOneMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXStockHoldbackOneMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ClinicalTrialAndDataPublicationMilestoneMember" xlink:label="loc_OCXClinicalTrialAndDataPublicationMilestoneMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXClinicalTrialAndDataPublicationMilestoneMember_80" xlink:type="arc" order="81"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CMSSpecifiedLungCancerMember" xlink:label="loc_OCXCMSSpecifiedLungCancerMember_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXCMSSpecifiedLungCancerMember_90" xlink:type="arc" order="91"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CMSReimbursementMilestonesMember" xlink:label="loc_OCXCMSReimbursementMilestonesMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXCMSReimbursementMilestonesMember_100" xlink:type="arc" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixBiomedicalIncMember" xlink:label="loc_OCXChronixBiomedicalIncMember_310"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXChronixBiomedicalIncMember_310" xlink:type="arc" order="311"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContingentConsiderationByTypeAxis" xlink:label="loc_us-gaapContingentConsiderationByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapContingentConsiderationByTypeAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="loc_us-gaapContingentConsiderationTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapContingentConsiderationByTypeAxis" xlink:to="loc_us-gaapContingentConsiderationTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContingentConsiderationTypeDomain" xlink:label="loc_us-gaapContingentConsiderationTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapContingentConsiderationByTypeAxis" xlink:to="loc_us-gaapContingentConsiderationTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MilestoneContingentConsiderationMember" xlink:label="loc_OCXMilestoneContingentConsiderationMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapContingentConsiderationTypeDomain" xlink:to="loc_OCXMilestoneContingentConsiderationMember_70" xlink:type="arc" order="71"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srtRangeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_srtRangeAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srtMaximumMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMaximumMember_100" xlink:type="arc" order="103"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaapStatementClassOfStockAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapStatementClassOfStockAxis" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaapClassOfStockDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementClassOfStockAxis" xlink:to="loc_us-gaapClassOfStockDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SeriesAConvertiblePreferredStockMember" xlink:label="loc_OCXSeriesAConvertiblePreferredStockMember_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfStockDomain" xlink:to="loc_OCXSeriesAConvertiblePreferredStockMember_150" xlink:type="arc" order="151"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorGenomicsIncMember" xlink:label="loc_OCXRazorGenomicsIncMember_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXRazorGenomicsIncMember_150" xlink:type="arc" order="152"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_EncoreClinicalIncMember" xlink:label="loc_OCXEncoreClinicalIncMember_240"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXEncoreClinicalIncMember_240" xlink:type="arc" order="242"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixBiomedicalIncMember" xlink:label="loc_OCXChronixBiomedicalIncMember_340"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXChronixBiomedicalIncMember_340" xlink:type="arc" order="343"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixMember" xlink:label="loc_OCXChronixMember_430"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXChronixMember_430" xlink:type="arc" order="431"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srtTitleOfIndividualAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_srtTitleOfIndividualAxis" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MinorityShareholdersMember" xlink:label="loc_OCXMinorityShareholdersMember_240"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXMinorityShareholdersMember_240" xlink:type="arc" order="243"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_GermanCustomerMember" xlink:label="loc_OCXGermanCustomerMember_360"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXGermanCustomerMember_360" xlink:type="arc" order="361"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaapAwardTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_us-gaapAwardTypeAxis" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CMSFinalMember" xlink:label="loc_OCXCMSFinalMember_280"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_OCXCMSFinalMember_280" xlink:type="arc" order="281"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srtProductOrServiceAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:to="loc_srtProductOrServiceAxis" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DetermaRxMember" xlink:label="loc_OCXDetermaRxMember_290"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXDetermaRxMember_290" xlink:type="arc" order="291"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Cash" xlink:label="loc_us-gaapCash_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapCash_450" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_450" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_450" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MergerConsideration" xlink:label="loc_OCXMergerConsideration_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXMergerConsideration_450" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PaymentsForMilestones" xlink:label="loc_OCXPaymentsForMilestones_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXPaymentsForMilestones_450" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsFairValueDisclosure_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsFairValueDisclosure_450" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaapFinanceLeaseWeightedAverageDiscountRatePercent_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapFinanceLeaseWeightedAverageDiscountRatePercent_450" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AcquisitionOfOffsetting" xlink:label="loc_OCXAcquisitionOfOffsetting_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXAcquisitionOfOffsetting_450" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_450" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OperatingLeaseRightOfUseLiability" xlink:label="loc_OCXOperatingLeaseRightOfUseLiability_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXOperatingLeaseRightOfUseLiability_450" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaapOperatingLeaseRightOfUseAsset_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapOperatingLeaseRightOfUseAsset_450" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CreditAndRiskadjustedDiscountRate" xlink:label="loc_OCXCreditAndRiskadjustedDiscountRate_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXCreditAndRiskadjustedDiscountRate_450" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FairValueOfContingentConsideration" xlink:label="loc_OCXFairValueOfContingentConsideration_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXFairValueOfContingentConsideration_450" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxLiabilities" xlink:label="loc_us-gaapDeferredTaxLiabilities_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapDeferredTaxLiabilities_450" xlink:type="arc" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_NumberOfSharesPurchased" xlink:label="loc_OCXNumberOfSharesPurchased_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXNumberOfSharesPurchased_450" xlink:type="arc" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaapPreferredStockParOrStatedValuePerShare_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapPreferredStockParOrStatedValuePerShare_450" xlink:type="arc" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaapEquityMethodInvestmentOwnershipPercentage_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapEquityMethodInvestmentOwnershipPercentage_450" xlink:type="arc" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentAggregateCost" xlink:label="loc_us-gaapEquityMethodInvestmentAggregateCost_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapEquityMethodInvestmentAggregateCost_450" xlink:type="arc" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaapCommonStockValue_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapCommonStockValue_450" xlink:type="arc" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaapPaymentsForRepurchaseOfCommonStock_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapPaymentsForRepurchaseOfCommonStock_450" xlink:type="arc" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ClinicalTrialExpenseReserveAmount" xlink:label="loc_OCXClinicalTrialExpenseReserveAmount_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXClinicalTrialExpenseReserveAmount_450" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_EstimatedClinicalTrialExpense" xlink:label="loc_OCXEstimatedClinicalTrialExpense_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXEstimatedClinicalTrialExpense_450" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestmentDescriptionOfPrincipalActivities" xlink:label="loc_us-gaapEquityMethodInvestmentDescriptionOfPrincipalActivities_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapEquityMethodInvestmentDescriptionOfPrincipalActivities_450" xlink:type="arc" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross" xlink:label="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross_450" xlink:type="arc" order="23"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PaymentObligationAmount" xlink:label="loc_OCXPaymentObligationAmount_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXPaymentObligationAmount_450" xlink:type="arc" order="24"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="loc_us-gaapLeaseExpirationDate1_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapLeaseExpirationDate1_450" xlink:type="arc" order="25"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaapEquityMethodInvestments_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapEquityMethodInvestments_450" xlink:type="arc" order="26"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MilestonePayment" xlink:label="loc_OCXMilestonePayment_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXMilestonePayment_450" xlink:type="arc" order="27"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives" xlink:label="loc_us-gaapPropertyPlantAndEquipmentEstimatedUsefulLives_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapPropertyPlantAndEquipmentEstimatedUsefulLives_450" xlink:type="arc" order="28"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts" xlink:label="loc_us-gaapBusinessAcquisitionCostOfAcquiredEntityTransactionCosts_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessAcquisitionCostOfAcquiredEntityTransactionCosts_450" xlink:type="arc" order="29"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet" xlink:label="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_450" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaapSharePrice_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapSharePrice_450" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BusinessCombinationSettlementNet" xlink:label="loc_OCXBusinessCombinationSettlementNet_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXBusinessCombinationSettlementNet_450" xlink:type="arc" order="32"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaapBusinessCombinationConsiderationTransferred1_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapBusinessCombinationConsiderationTransferred1_450" xlink:type="arc" order="33"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_EarnoutPercentageOnCollectionsForSales" xlink:label="loc_OCXEarnoutPercentageOnCollectionsForSales_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXEarnoutPercentageOnCollectionsForSales_450" xlink:type="arc" order="34"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_EarnoutPercentageOnCollectionsForSaleOrLicense" xlink:label="loc_OCXEarnoutPercentageOnCollectionsForSaleOrLicense_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXEarnoutPercentageOnCollectionsForSaleOrLicense_450" xlink:type="arc" order="35"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ExcessLiabilities" xlink:label="loc_OCXExcessLiabilities_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXExcessLiabilities_450" xlink:type="arc" order="36"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaapLiabilities_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapLiabilities_450" xlink:type="arc" order="37"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_UpfrontPaymentReceived" xlink:label="loc_OCXUpfrontPaymentReceived_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXUpfrontPaymentReceived_450" xlink:type="arc" order="38"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ValueAddedTaxTermOfContract" xlink:label="loc_OCXValueAddedTaxTermOfContract_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_OCXValueAddedTaxTermOfContract_450" xlink:type="arc" order="39"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredRevenue" xlink:label="loc_us-gaapDeferredRevenue_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapDeferredRevenue_450" xlink:type="arc" order="40"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaapGoodwill_450"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionLineItems" xlink:to="loc_us-gaapGoodwill_450" xlink:type="arc" order="41"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfGoodwillAndIntangibleAssetsDetails" xlink:title="00000047 - Disclosure - Schedule of Goodwill and Intangible Assets (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaapScheduleOfFiniteLivedIntangibleAssetsTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapScheduleOfFiniteLivedIntangibleAssetsTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaapBusinessAcquisitionAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="loc_us-gaapBusinessAcquisitionAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaapBusinessAcquisitionAcquireeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapBusinessAcquisitionAxis" xlink:to="loc_us-gaapBusinessAcquisitionAcquireeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_InsightMergerAgreementsMember" xlink:label="loc_OCXInsightMergerAgreementsMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXInsightMergerAgreementsMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ChronixBiomedicalIncMember" xlink:label="loc_OCXChronixBiomedicalIncMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapBusinessAcquisitionAcquireeDomain" xlink:to="loc_OCXChronixBiomedicalIncMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DetermaIOMember" xlink:label="loc_OCXDetermaIOMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXDetermaIOMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TheraSureMember" xlink:label="loc_OCXTheraSureMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXTheraSureMember_80" xlink:type="arc" order="81"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorGenomicsIncMember" xlink:label="loc_OCXRazorGenomicsIncMember_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXRazorGenomicsIncMember_120" xlink:type="arc" order="121"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfFiniteLivedIntangibleAssetsTable" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsByMajorClassAxis" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaapCustomerRelationshipsMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:to="loc_us-gaapCustomerRelationshipsMember_100" xlink:type="arc" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaapGoodwill_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapGoodwill_150" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IndefinitelivedIntangibleAssetsAcquired" xlink:label="loc_us-gaapIndefinitelivedIntangibleAssetsAcquired_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapIndefinitelivedIntangibleAssetsAcquired_150" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue" xlink:label="loc_us-gaapAcquiredFiniteLivedIntangibleAssetResidualValue_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapAcquiredFiniteLivedIntangibleAssetResidualValue_150" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill" xlink:label="loc_us-gaapIntangibleAssetsGrossExcludingGoodwill_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapIntangibleAssetsGrossExcludingGoodwill_150" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaapFiniteLivedIntangibleAssetsAccumulatedAmortization_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapFiniteLivedIntangibleAssetsAccumulatedAmortization_150" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaapIntangibleAssetsNetExcludingGoodwill_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapFiniteLivedIntangibleAssetsLineItems" xlink:to="loc_us-gaapIntangibleAssetsNetExcludingGoodwill_150" xlink:type="arc" order="5"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfIntangibleAssetsFutureAmortizationExpenseDetails" xlink:title="00000048 - Disclosure - Schedule of Intangible Assets Future Amortization Expense (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ShareholdersEquityDetailsNarrative" xlink:title="00000049 - Disclosure - Shareholders’ Equity (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaapCommonStockMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_us-gaapCommonStockMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaapTypeOfArrangementAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:to="loc_us-gaapTypeOfArrangementAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ATMAgreementMember" xlink:label="loc_OCXATMAgreementMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXATMAgreementMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AtTheMarketSalesAgreementMember" xlink:label="loc_OCXAtTheMarketSalesAgreementMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXAtTheMarketSalesAgreementMember_50" xlink:type="arc" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srtTitleOfIndividualAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:to="loc_srtTitleOfIndividualAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SalesAgentMember" xlink:label="loc_OCXSalesAgentMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXSalesAgentMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BTIGLLCMember" xlink:label="loc_OCXBTIGLLCMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXBTIGLLCMember_50" xlink:type="arc" order="52"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srtRangeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:to="loc_srtRangeAxis" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember" xlink:label="loc_srtMinimumMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMinimumMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srtMaximumMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMaximumMember_70" xlink:type="arc" order="71"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaapDerivativeInstrumentRiskAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossTable" xlink:to="loc_us-gaapDerivativeInstrumentRiskAxis" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaapDerivativeContractTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapDerivativeInstrumentRiskAxis" xlink:to="loc_us-gaapDerivativeContractTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaapDerivativeContractTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapDerivativeInstrumentRiskAxis" xlink:to="loc_us-gaapDerivativeContractTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockOptionMember" xlink:label="loc_us-gaapStockOptionMember_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapDerivativeContractTypeDomain" xlink:to="loc_us-gaapStockOptionMember_90" xlink:type="arc" order="91"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaapPreferredStockSharesAuthorized_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapPreferredStockSharesAuthorized_130" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockNoParValue" xlink:label="loc_us-gaapPreferredStockNoParValue_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapPreferredStockNoParValue_130" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_us-gaapPreferredStockSharesIssued_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapPreferredStockSharesIssued_130" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_us-gaapPreferredStockSharesOutstanding_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapPreferredStockSharesOutstanding_130" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaapCommonStockSharesAuthorized_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapCommonStockSharesAuthorized_130" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockNoParValue" xlink:label="loc_us-gaapCommonStockNoParValue_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapCommonStockNoParValue_130" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_130" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaapProceedsFromIssuanceOfCommonStock_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapProceedsFromIssuanceOfCommonStock_130" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction" xlink:label="loc_us-gaapSaleOfStockConsiderationReceivedOnTransaction_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapSaleOfStockConsiderationReceivedOnTransaction_130" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_us-gaapCommonStockSharesOutstanding_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapCommonStockSharesOutstanding_130" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="loc_us-gaapClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_130" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_130" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantsAndRightsOutstandingMaturityDate" xlink:label="loc_us-gaapWarrantsAndRightsOutstandingMaturityDate_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapWarrantsAndRightsOutstandingMaturityDate_130" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesStockOptionsExercised_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesStockOptionsExercised_130" xlink:type="arc" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueStockOptionsExercised_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapAccumulatedOtherComprehensiveIncomeLossLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueStockOptionsExercised_130" xlink:type="arc" order="14"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/SummaryOfStockOptionActivityDetails" xlink:title="00000050 - Disclosure - Summary of Stock Option Activity (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_us-gaapPlanNameAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandTenPlanActivityMember" xlink:label="loc_OCXTwoThousandTenPlanActivityMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandTenPlanActivityMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandEighteenPalnActivityMember" xlink:label="loc_OCXTwoThousandEighteenPalnActivityMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandEighteenPalnActivityMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_70" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_70" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_70" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_70" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesStockOptionsExercised_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesStockOptionsExercised_70" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_70" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_70" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_70" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_70" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_70" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1" xlink:label="loc_us-gaapSharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapSharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_70" xlink:type="arc" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_70" xlink:type="arc" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableRestrictedStockOptionsVestedInPeriod" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableRestrictedStockOptionsVestedInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableRestrictedStockOptionsVestedInPeriod_70" xlink:type="arc" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsVestedInPeriod" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsVestedInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsVestedInPeriod_70" xlink:type="arc" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodRSUs" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodRSUs_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodRSUs_70" xlink:type="arc" order="17"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableRestrictedStockOptionsGrantsInPeriodGross" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableRestrictedStockOptionsGrantsInPeriodGross_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableRestrictedStockOptionsGrantsInPeriodGross_70" xlink:type="arc" order="18"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsGrantsInPeriodGross" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsGrantsInPeriodGross_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockOptionsGrantsInPeriodGross_70" xlink:type="arc" order="19"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodRSUs" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodRSUs_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodRSUs_70" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementsByShareBasedPaymentAwardRestrictedStockOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_OCXShareBasedCompensationArrangementsByShareBasedPaymentAwardRestrictedStockOptionsGrantsInPeriodWeightedAverageExercisePrice_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementsByShareBasedPaymentAwardRestrictedStockOptionsGrantsInPeriodWeightedAverageExercisePrice_70" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsIncreaseNumberOfShares" xlink:label="loc_OCXSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsIncreaseNumberOfShares_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsIncreaseNumberOfShares_70" xlink:type="arc" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIncreaseInPeriodGross" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIncreaseInPeriodGross_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIncreaseInPeriodGross_70" xlink:type="arc" order="23"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncreaseInPeriod" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncreaseInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncreaseInPeriod_70" xlink:type="arc" order="24"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableGrantsInPeriodGross" xlink:label="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableGrantsInPeriodGross_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAvailableGrantsInPeriodGross_70" xlink:type="arc" order="25"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_70" xlink:type="arc" order="26"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_70" xlink:type="arc" order="27"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_70" xlink:type="arc" order="28"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_70" xlink:type="arc" order="29"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_70" xlink:type="arc" order="30"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfStockOptionsOutstandingVestedAndExercisableDetails" xlink:title="00000051 - Disclosure - Schedule of Stock Options Outstanding, Vested and Exercisable (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaapScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ExercisePriceRangeOneMember" xlink:label="loc_OCXExercisePriceRangeOneMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:to="loc_OCXExercisePriceRangeOneMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ExercisePriceRangeTwoMember" xlink:label="loc_OCXExercisePriceRangeTwoMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:to="loc_OCXExercisePriceRangeTwoMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ExercisePriceRangeThreeMember" xlink:label="loc_OCXExercisePriceRangeThreeMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:to="loc_OCXExercisePriceRangeThreeMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_90" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_90" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_90" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_90" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_90" xlink:type="arc" order="4"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/SummaryOfStock-basedCompensationExpenseDetails" xlink:title="00000052 - Disclosure - Summary of Stock-based Compensation Expense (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaapAwardTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_us-gaapAwardTypeAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaapEmployeeStockOptionMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaapEmployeeStockOptionMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaapIncomeStatementLocationAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_us-gaapIncomeStatementLocationAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CostOfRevenuesMember" xlink:label="loc_OCXCostOfRevenuesMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_OCXCostOfRevenuesMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaapResearchAndDevelopmentExpenseMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_us-gaapResearchAndDevelopmentExpenseMember_20" xlink:type="arc" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaapSellingAndMarketingExpenseMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_us-gaapSellingAndMarketingExpenseMember_40" xlink:type="arc" order="42"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember" xlink:label="loc_us-gaapSellingGeneralAndAdministrativeExpensesMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_us-gaapSellingGeneralAndAdministrativeExpensesMember_60" xlink:type="arc" order="62"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaapAllocatedShareBasedCompensationExpense_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapAllocatedShareBasedCompensationExpense_110" xlink:type="arc" order="0"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfAssumptionsUsedToCalculateFairValueOfStockOptionsDetails" xlink:title="00000053 - Disclosure - Schedule of Assumptions Used to Calculate Fair Value of Stock Options (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Stock-basedCompensationDetailsNarrative" xlink:title="00000054 - Disclosure - Stock-Based Compensation (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaapPlanNameAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_us-gaapPlanNameAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaapPlanNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPlanNameAxis" xlink:to="loc_us-gaapPlanNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandTenStockOptionPlanMember" xlink:label="loc_OCXTwoThousandTenStockOptionPlanMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandTenStockOptionPlanMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandEighteenIncentivePlanMember" xlink:label="loc_OCXTwoThousandEighteenIncentivePlanMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandEighteenIncentivePlanMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandEighteenPalnMember" xlink:label="loc_OCXTwoThousandEighteenPalnMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandEighteenPalnMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PerformanceBasedOptionsMember" xlink:label="loc_OCXPerformanceBasedOptionsMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXPerformanceBasedOptionsMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_TwoThousandTenPalnAndTwoThousandEighteenMember" xlink:label="loc_OCXTwoThousandTenPalnAndTwoThousandEighteenMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPlanNameDomain" xlink:to="loc_OCXTwoThousandTenPalnAndTwoThousandEighteenMember_100" xlink:type="arc" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaapAwardTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_us-gaapAwardTypeAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapAwardTypeAxis" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockAppreciationRightsSARSMember" xlink:label="loc_us-gaapStockAppreciationRightsSARSMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaapStockAppreciationRightsSARSMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaapRestrictedStockUnitsRSUMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaapRestrictedStockUnitsRSUMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srtTitleOfIndividualAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_srtTitleOfIndividualAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_EmployeesAndConsultantsMember" xlink:label="loc_OCXEmployeesAndConsultantsMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXEmployeesAndConsultantsMember_50" xlink:type="arc" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DetermaDxMember" xlink:label="loc_OCXDetermaDxMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXDetermaDxMember_70" xlink:type="arc" order="72"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_170" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_170" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardDescription_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardDescription_170" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StockOptionExercisable" xlink:label="loc_OCXStockOptionExercisable_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_OCXStockOptionExercisable_170" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit_170" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit" xlink:label="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit_170" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares" xlink:label="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapSharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_170" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaapAllocatedShareBasedCompensationExpense_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapAllocatedShareBasedCompensationExpense_170" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber" xlink:label="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_170" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions" xlink:label="loc_us-gaapEmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapEmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_170" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaapEmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapEmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_170" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice" xlink:label="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:to="loc_us-gaapShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_170" xlink:type="arc" order="11"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfConsolidatedRevenuesAttributableToProductsOrServicesDetails" xlink:title="00000055 - Disclosure - Schedule of Consolidated Revenues Attributable to Products or Services (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductInformationLineItems" xlink:label="loc_us-gaapProductInformationLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductInformationTable" xlink:label="loc_us-gaapScheduleOfProductInformationTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapScheduleOfProductInformationTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srtProductOrServiceAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_srtProductOrServiceAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DetermaRxMember" xlink:label="loc_OCXDetermaRxMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXDetermaRxMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PharmaServicesMember" xlink:label="loc_OCXPharmaServicesMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXPharmaServicesMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LicenseMember" xlink:label="loc_us-gaapLicenseMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_us-gaapLicenseMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaapConcentrationRiskByBenchmarkAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="loc_us-gaapSalesRevenueNetMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_us-gaapSalesRevenueNetMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaapConcentrationRiskByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByTypeAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductConcentrationRiskMember" xlink:label="loc_us-gaapProductConcentrationRiskMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskTypeDomain" xlink:to="loc_us-gaapProductConcentrationRiskMember_0" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicConcentrationRiskMember" xlink:label="loc_us-gaapGeographicConcentrationRiskMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskTypeDomain" xlink:to="loc_us-gaapGeographicConcentrationRiskMember_60" xlink:type="arc" order="62"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaapConcentrationRiskPercentage1_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapConcentrationRiskPercentage1_90" xlink:type="arc" order="0"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfConsolidatedRevenuesGeneratedByUnaffiliatedCustomersDetails" xlink:title="00000056 - Disclosure - Schedule of Consolidated Revenues Generated by Unaffiliated Customers (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductInformationLineItems" xlink:label="loc_us-gaapProductInformationLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductInformationTable" xlink:label="loc_us-gaapScheduleOfProductInformationTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapScheduleOfProductInformationTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srtProductOrServiceAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_srtProductOrServiceAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srtProductsAndServicesDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtProductOrServiceAxis" xlink:to="loc_srtProductsAndServicesDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MedicareforDetermaRxMember" xlink:label="loc_OCXMedicareforDetermaRxMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXMedicareforDetermaRxMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MedicareAdvantageforDetermaRxMember" xlink:label="loc_OCXMedicareAdvantageforDetermaRxMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXMedicareAdvantageforDetermaRxMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PharmaservicesCompanyAMember" xlink:label="loc_OCXPharmaservicesCompanyAMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXPharmaservicesCompanyAMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PharmaServicesCompanyBMember" xlink:label="loc_OCXPharmaServicesCompanyBMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXPharmaServicesCompanyBMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LicenseCompanyDMember" xlink:label="loc_OCXLicenseCompanyDMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXLicenseCompanyDMember_80" xlink:type="arc" order="81"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LicenseCompanyBMember" xlink:label="loc_OCXLicenseCompanyBMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtProductsAndServicesDomain" xlink:to="loc_OCXLicenseCompanyBMember_100" xlink:type="arc" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaapConcentrationRiskByBenchmarkAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="loc_us-gaapSalesRevenueNetMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_us-gaapSalesRevenueNetMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaapConcentrationRiskByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByTypeAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductConcentrationRiskMember" xlink:label="loc_us-gaapProductConcentrationRiskMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskTypeDomain" xlink:to="loc_us-gaapProductConcentrationRiskMember_0" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaapConcentrationRiskPercentage1_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapConcentrationRiskPercentage1_130" xlink:type="arc" order="0"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfPercentageOfConsolidatedRevenuesAttributableToGeographicalLocationsDetails" xlink:title="00000057 - Disclosure - Schedule of Percentage of Consolidated Revenues Attributable to Geographical Locations (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductInformationLineItems" xlink:label="loc_us-gaapProductInformationLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductInformationTable" xlink:label="loc_us-gaapScheduleOfProductInformationTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapScheduleOfProductInformationTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srtStatementGeographicalAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_srtStatementGeographicalAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srtSegmentGeographicalDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtStatementGeographicalAxis" xlink:to="loc_srtSegmentGeographicalDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US" xlink:label="loc_countryUS_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_countryUS_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OutsideUnitedStatesPharmaServicesMember" xlink:label="loc_OCXOutsideUnitedStatesPharmaServicesMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_OCXOutsideUnitedStatesPharmaServicesMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OutsideUnitedStatesLicensingMember" xlink:label="loc_OCXOutsideUnitedStatesLicensingMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtSegmentGeographicalDomain" xlink:to="loc_OCXOutsideUnitedStatesLicensingMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaapConcentrationRiskByBenchmarkAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SalesRevenueNetMember" xlink:label="loc_us-gaapSalesRevenueNetMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_us-gaapSalesRevenueNetMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaapConcentrationRiskByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByTypeAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeographicConcentrationRiskMember" xlink:label="loc_us-gaapGeographicConcentrationRiskMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskTypeDomain" xlink:to="loc_us-gaapGeographicConcentrationRiskMember_0" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaapConcentrationRiskPercentage1_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapConcentrationRiskPercentage1_90" xlink:type="arc" order="0"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfPercentageOfTotalConsolidatedAccountsReceivablesDetails" xlink:title="00000058 - Disclosure - Schedule of Percentage of Total Consolidated Accounts Receivables (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProductInformationLineItems" xlink:label="loc_us-gaapProductInformationLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfProductInformationTable" xlink:label="loc_us-gaapScheduleOfProductInformationTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapScheduleOfProductInformationTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MajorCustomersAxis" xlink:label="loc_srtMajorCustomersAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_srtMajorCustomersAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srtNameOfMajorCustomerDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtMajorCustomersAxis" xlink:to="loc_srtNameOfMajorCustomerDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_NameOfMajorCustomerDomain" xlink:label="loc_srtNameOfMajorCustomerDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtMajorCustomersAxis" xlink:to="loc_srtNameOfMajorCustomerDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MedicareforDetermaRxMember" xlink:label="loc_OCXMedicareforDetermaRxMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtNameOfMajorCustomerDomain" xlink:to="loc_OCXMedicareforDetermaRxMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MedicareAdvantageforDetermaRxMember" xlink:label="loc_OCXMedicareAdvantageforDetermaRxMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtNameOfMajorCustomerDomain" xlink:to="loc_OCXMedicareAdvantageforDetermaRxMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PharmaservicesCompanyAMember" xlink:label="loc_OCXPharmaservicesCompanyAMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtNameOfMajorCustomerDomain" xlink:to="loc_OCXPharmaservicesCompanyAMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaapConcentrationRiskByBenchmarkAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaapConcentrationRiskBenchmarkDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByBenchmarkAxis" xlink:to="loc_us-gaapConcentrationRiskBenchmarkDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableMember" xlink:label="loc_us-gaapAccountsReceivableMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskBenchmarkDomain" xlink:to="loc_us-gaapAccountsReceivableMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaapConcentrationRiskByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfProductInformationTable" xlink:to="loc_us-gaapConcentrationRiskByTypeAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaapConcentrationRiskTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapConcentrationRiskByTypeAxis" xlink:to="loc_us-gaapConcentrationRiskTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="loc_us-gaapCustomerConcentrationRiskMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapConcentrationRiskTypeDomain" xlink:to="loc_us-gaapCustomerConcentrationRiskMember_0" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskPercentage1" xlink:label="loc_us-gaapConcentrationRiskPercentage1_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapProductInformationLineItems" xlink:to="loc_us-gaapConcentrationRiskPercentage1_50" xlink:type="arc" order="0"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfComponentsOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:title="00000059 - Disclosure - Schedule of Components of Deferred Tax Assets and Liabilities (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfIncomeTaxReconciliationDetails" xlink:title="00000060 - Disclosure - Schedule of Income Tax Reconciliation (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfUnrecognizedTaxBenefitDetails" xlink:title="00000061 - Disclosure - Schedule of Unrecognized Tax Benefit (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/IncomeTaxesDetailsNarrative" xlink:title="00000062 - Disclosure - Income Taxes (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="loc_us-gaapOperatingLossCarryforwardsLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="loc_us-gaapOperatingLossCarryforwardsTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapOperatingLossCarryforwardsTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis" xlink:label="loc_us-gaapIncomeTaxAuthorityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapOperatingLossCarryforwardsTable" xlink:to="loc_us-gaapIncomeTaxAuthorityAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaapIncomeTaxAuthorityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIncomeTaxAuthorityAxis" xlink:to="loc_us-gaapIncomeTaxAuthorityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain" xlink:label="loc_us-gaapIncomeTaxAuthorityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIncomeTaxAuthorityAxis" xlink:to="loc_us-gaapIncomeTaxAuthorityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember" xlink:label="loc_us-gaapDomesticCountryMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeTaxAuthorityDomain" xlink:to="loc_us-gaapDomesticCountryMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember" xlink:label="loc_us-gaapStateAndLocalJurisdictionMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeTaxAuthorityDomain" xlink:to="loc_us-gaapStateAndLocalJurisdictionMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FederalMember" xlink:label="loc_OCXFederalMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeTaxAuthorityDomain" xlink:to="loc_OCXFederalMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_StateMember" xlink:label="loc_OCXStateMember_70"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeTaxAuthorityDomain" xlink:to="loc_OCXStateMember_70" xlink:type="arc" order="71"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FederalandStateMember" xlink:label="loc_OCXFederalandStateMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeTaxAuthorityDomain" xlink:to="loc_OCXFederalandStateMember_100" xlink:type="arc" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis" xlink:label="loc_us-gaapIncomeStatementLocationAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapOperatingLossCarryforwardsTable" xlink:to="loc_us-gaapIncomeStatementLocationAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain" xlink:label="loc_us-gaapIncomeStatementLocationDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapIncomeStatementLocationAxis" xlink:to="loc_us-gaapIncomeStatementLocationDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaapResearchAndDevelopmentExpenseMember_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapIncomeStatementLocationDomain" xlink:to="loc_us-gaapResearchAndDevelopmentExpenseMember_110" xlink:type="arc" order="112"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaapIncomeTaxExpenseBenefit_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapIncomeTaxExpenseBenefit_170" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PartialReleaseOfValuationAllownces" xlink:label="loc_OCXPartialReleaseOfValuationAllownces_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_OCXPartialReleaseOfValuationAllownces_170" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards" xlink:label="loc_us-gaapDeferredTaxAssetsOperatingLossCarryforwards_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapDeferredTaxAssetsOperatingLossCarryforwards_170" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_NetOperatingLossExpirationPeriodDescription" xlink:label="loc_OCXNetOperatingLossExpirationPeriodDescription_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_OCXNetOperatingLossExpirationPeriodDescription_170" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch" xlink:label="loc_us-gaapDeferredTaxAssetsTaxCreditCarryforwardsResearch_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapDeferredTaxAssetsTaxCreditCarryforwardsResearch_170" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CreditCarryforwardExpirationTerm" xlink:label="loc_OCXCreditCarryforwardExpirationTerm_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_OCXCreditCarryforwardExpirationTerm_170" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaapIncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapIncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_170" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefits" xlink:label="loc_us-gaapUnrecognizedTaxBenefits_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapUnrecognizedTaxBenefits_170" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued" xlink:label="loc_us-gaapIncomeTaxExaminationPenaltiesAndInterestAccrued_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapIncomeTaxExaminationPenaltiesAndInterestAccrued_170" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DerecognizedUncertainTaxPosition" xlink:label="loc_OCXDerecognizedUncertainTaxPosition_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_OCXDerecognizedUncertainTaxPosition_170" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherInformationPertainingToIncomeTaxes" xlink:label="loc_us-gaapOtherInformationPertainingToIncomeTaxes_170"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapOperatingLossCarryforwardsLineItems" xlink:to="loc_us-gaapOtherInformationPertainingToIncomeTaxes_170" xlink:type="arc" order="11"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfRight-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressDetails" xlink:title="00000063 - Disclosure - Schedule of Right-of-use Assets, Machinery and Equipment, Net, and Construction in Progress (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/Right-of-useAssetsMachineryAndEquipmentNetAndConstructionInProgressDetailsNarrative" xlink:title="00000064 - Disclosure - Right-of-use Assets, Machinery and Equipment, Net and Construction in Progress (Details Narrative)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfSupplementalCashFlowInformationRelatedToOperatingAndFinancingLeaseDetails" xlink:title="00000065 - Disclosure - Schedule of Supplemental Cash Flow Information Related to Operating and Financing Lease (Details)"/> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfSupplementalBalanceSheetInformationRelatedToOperatingAndFinancingLeasesDetails" xlink:title="00000066 - Disclosure - Schedule of Supplemental Balance Sheet Information Related to Operating and Financing Leases (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaapLesseeLeaseDescriptionLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaapLesseeLeaseDescriptionTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapLesseeLeaseDescriptionTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermAxis" xlink:label="loc_us-gaapLeaseContractualTermAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapLesseeLeaseDescriptionTable" xlink:to="loc_us-gaapLeaseContractualTermAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermDomain" xlink:label="loc_us-gaapLeaseContractualTermDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapLeaseContractualTermAxis" xlink:to="loc_us-gaapLeaseContractualTermDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermDomain" xlink:label="loc_us-gaapLeaseContractualTermDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapLeaseContractualTermAxis" xlink:to="loc_us-gaapLeaseContractualTermDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OperatingAndFinancingLeasesMember" xlink:label="loc_OCXOperatingAndFinancingLeasesMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLeaseContractualTermDomain" xlink:to="loc_OCXOperatingAndFinancingLeasesMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OperatingLeaseRightOfUseAssets" xlink:label="loc_OCXOperatingLeaseRightOfUseAssets_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_OCXOperatingLeaseRightOfUseAssets_20" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaapOperatingLeaseLiabilityCurrent_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapOperatingLeaseLiabilityCurrent_20" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaapOperatingLeaseLiabilityNoncurrent_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapOperatingLeaseLiabilityNoncurrent_20" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaapOperatingLeaseLiability_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapOperatingLeaseLiability_20" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization" xlink:label="loc_us-gaapFinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_20" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization" xlink:label="loc_us-gaapFinanceLeaseRightOfUseAssetAccumulatedAmortization_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseRightOfUseAssetAccumulatedAmortization_20" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset" xlink:label="loc_us-gaapFinanceLeaseRightOfUseAsset_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseRightOfUseAsset_20" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent" xlink:label="loc_us-gaapFinanceLeaseLiabilityCurrent_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityCurrent_20" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent" xlink:label="loc_us-gaapFinanceLeaseLiabilityNoncurrent_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityNoncurrent_20" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaapFinanceLeaseLiability_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseLiability_20" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaapOperatingLeaseWeightedAverageRemainingLeaseTerm1_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapOperatingLeaseWeightedAverageRemainingLeaseTerm1_20" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaapFinanceLeaseWeightedAverageRemainingLeaseTerm1_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseWeightedAverageRemainingLeaseTerm1_20" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaapOperatingLeaseWeightedAverageDiscountRatePercent_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapOperatingLeaseWeightedAverageDiscountRatePercent_20" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent" xlink:label="loc_us-gaapFinanceLeaseWeightedAverageDiscountRatePercent_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapLesseeLeaseDescriptionLineItems" xlink:to="loc_us-gaapFinanceLeaseWeightedAverageDiscountRatePercent_20" xlink:type="arc" order="13"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfFutureMinimumLeaseCommitmentsForOperatingAndFinancingLeasesDetails" xlink:title="00000067 - Disclosure - Schedule of Future Minimum Lease Commitments for Operating and Financing Leases (Details)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LeaseContractTypeAxis" xlink:label="loc_OCXLeaseContractTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_OCXLeaseContractTypeAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LeaseContractTypeDomain" xlink:label="loc_OCXLeaseContractTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_OCXLeaseContractTypeAxis" xlink:to="loc_OCXLeaseContractTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LeaseContractTypeDomain" xlink:label="loc_OCXLeaseContractTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_OCXLeaseContractTypeAxis" xlink:to="loc_OCXLeaseContractTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OperatingLeaseMember" xlink:label="loc_OCXOperatingLeaseMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_OCXLeaseContractTypeDomain" xlink:to="loc_OCXOperatingLeaseMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FinancingLeaseMember" xlink:label="loc_OCXFinancingLeaseMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_OCXLeaseContractTypeDomain" xlink:to="loc_OCXFinancingLeaseMember_10" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_30" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueNextTwelveMonths_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueNextTwelveMonths_30" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearTwo_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearTwo_30" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearTwo_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearTwo_30" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearThree_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearThree_30" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearThree_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearThree_30" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearFour_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearFour_30" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearFour_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearFour_30" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearFive_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueYearFive_30" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearFive_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueYearFive_30" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_30" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDueAfterYearFive_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDueAfterYearFive_30" xlink:type="arc" order="11"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDue_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityPaymentsDue_30" xlink:type="arc" order="12"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaapFinanceLeaseLiabilityPaymentsDue_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityPaymentsDue_30" xlink:type="arc" order="13"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaapLesseeOperatingLeaseLiabilityUndiscountedExcessAmount_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapLesseeOperatingLeaseLiabilityUndiscountedExcessAmount_30" xlink:type="arc" order="14"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaapFinanceLeaseLiabilityUndiscountedExcessAmount_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiabilityUndiscountedExcessAmount_30" xlink:type="arc" order="15"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PresentValueOfNetMinimumLeasePayments" xlink:label="loc_OCXPresentValueOfNetMinimumLeasePayments_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXPresentValueOfNetMinimumLeasePayments_30" xlink:type="arc" order="16"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaapFinanceLeaseLiability_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapFinanceLeaseLiability_30" xlink:type="arc" order="17"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/CommitmentsAndContingenciesDetailsNarrative" xlink:title="00000068 - Disclosure - Commitments and Contingencies (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:label="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaapTypeOfArrangementAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapTypeOfArrangementAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_OfficeLeaseAgreementMember" xlink:label="loc_OCXOfficeLeaseAgreementMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXOfficeLeaseAgreementMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LeaseAgreementMember" xlink:label="loc_OCXLeaseAgreementMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXLeaseAgreementMember_50" xlink:type="arc" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RazorsLaboratoryAgreementMember" xlink:label="loc_OCXRazorsLaboratoryAgreementMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXRazorsLaboratoryAgreementMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementScenarioAxis" xlink:label="loc_srtStatementScenarioAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_srtStatementScenarioAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srtScenarioUnspecifiedDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtStatementScenarioAxis" xlink:to="loc_srtScenarioUnspecifiedDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScenarioUnspecifiedDomain" xlink:label="loc_srtScenarioUnspecifiedDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtStatementScenarioAxis" xlink:to="loc_srtScenarioUnspecifiedDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MonthlyRentMember" xlink:label="loc_OCXMonthlyRentMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtScenarioUnspecifiedDomain" xlink:to="loc_OCXMonthlyRentMember_20" xlink:type="arc" order="21"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_FirstTenCalendarMember" xlink:label="loc_OCXFirstTenCalendarMember_30"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtScenarioUnspecifiedDomain" xlink:to="loc_OCXFirstTenCalendarMember_30" xlink:type="arc" order="31"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srtTitleOfIndividualAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_srtTitleOfIndividualAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LandlordMember" xlink:label="loc_OCXLandlordMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXLandlordMember_40" xlink:type="arc" order="42"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapPropertyPlantAndEquipmentByTypeAxis" xlink:to="loc_us-gaapPropertyPlantAndEquipmentTypeDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LaboratoryEquipmentMember" xlink:label="loc_OCXLaboratoryEquipmentMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapPropertyPlantAndEquipmentTypeDomain" xlink:to="loc_OCXLaboratoryEquipmentMember_80" xlink:type="arc" order="81"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AreaOfLand" xlink:label="loc_us-gaapAreaOfLand_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapAreaOfLand_100" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRent" xlink:label="loc_us-gaapPaymentsForRent_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapPaymentsForRent_100" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_CapitalLeaseAgreementImputedAnnualInterestRate" xlink:label="loc_OCXCapitalLeaseAgreementImputedAnnualInterestRate_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXCapitalLeaseAgreementImputedAnnualInterestRate_100" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_ObligatedToPayExpensesAndTaxesPercentage" xlink:label="loc_OCXObligatedToPayExpensesAndTaxesPercentage_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXObligatedToPayExpensesAndTaxesPercentage_100" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForProceedsFromTenantAllowance" xlink:label="loc_us-gaapPaymentsForProceedsFromTenantAllowance_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapPaymentsForProceedsFromTenantAllowance_100" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PercentageOfAdiministrativeFeePaidOnOriginalCostOfEquipment" xlink:label="loc_OCXPercentageOfAdiministrativeFeePaidOnOriginalCostOfEquipment_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXPercentageOfAdiministrativeFeePaidOnOriginalCostOfEquipment_100" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SecurityDeposit" xlink:label="loc_us-gaapSecurityDeposit_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapSecurityDeposit_100" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LinesOfCreditCurrent" xlink:label="loc_us-gaapLinesOfCreditCurrent_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapLinesOfCreditCurrent_100" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseExpirationDate1" xlink:label="loc_us-gaapLeaseExpirationDate1_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapLeaseExpirationDate1_100" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PaymentsDueToTheLandLordForEarlyCancellation" xlink:label="loc_OCXPaymentsDueToTheLandLordForEarlyCancellation_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXPaymentsDueToTheLandLordForEarlyCancellation_100" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PaymentObligationAmount" xlink:label="loc_OCXPaymentObligationAmount_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXPaymentObligationAmount_100" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeveranceCosts1" xlink:label="loc_us-gaapSeveranceCosts1_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapSeveranceCosts1_100" xlink:type="arc" order="11"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/RelatedPartyTransactionsDetailsNarrative" xlink:title="00000069 - Disclosure - Related Party Transactions (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaapStatementLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaapStatementTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStatementTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_LegalEntityAxis" xlink:label="loc_deiLegalEntityAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_deiLegalEntityAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021q4/dei-2021q4.xsd#dei_EntityDomain" xlink:label="loc_deiEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_deiLegalEntityAxis" xlink:to="loc_deiEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PuraVidaInvestmentsLLCMember" xlink:label="loc_OCXPuraVidaInvestmentsLLCMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXPuraVidaInvestmentsLLCMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BroadwoodCapitalLPMember" xlink:label="loc_OCXBroadwoodCapitalLPMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_deiEntityDomain" xlink:to="loc_OCXBroadwoodCapitalLPMember_80" xlink:type="arc" order="82"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis" xlink:label="loc_srtTitleOfIndividualAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtTitleOfIndividualAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtTitleOfIndividualAxis" xlink:to="loc_srtTitleOfIndividualWithRelationshipToEntityDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_InstitutionalInvestorsMember" xlink:label="loc_OCXInstitutionalInvestorsMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXInstitutionalInvestorsMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_RonaldAndrewsMember" xlink:label="loc_OCXRonaldAndrewsMember_130"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtTitleOfIndividualWithRelationshipToEntityDomain" xlink:to="loc_OCXRonaldAndrewsMember_130" xlink:type="arc" order="131"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaapTypeOfArrangementAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapTypeOfArrangementAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_SubscriptionAgreementsMember" xlink:label="loc_OCXSubscriptionAgreementsMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXSubscriptionAgreementsMember_40" xlink:type="arc" order="42"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_WarrantExerciseAgreementsMember" xlink:label="loc_OCXWarrantExerciseAgreementsMember_90"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXWarrantExerciseAgreementsMember_90" xlink:type="arc" order="91"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis" xlink:label="loc_us-gaapSubsidiarySaleOfStockAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_us-gaapSubsidiarySaleOfStockAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaapSaleOfStockNameOfTransactionDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapSubsidiarySaleOfStockAxis" xlink:to="loc_us-gaapSaleOfStockNameOfTransactionDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain" xlink:label="loc_us-gaapSaleOfStockNameOfTransactionDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapSubsidiarySaleOfStockAxis" xlink:to="loc_us-gaapSaleOfStockNameOfTransactionDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_UnderwrittenPublicOfferingMember" xlink:label="loc_OCXUnderwrittenPublicOfferingMember_60"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapSaleOfStockNameOfTransactionDomain" xlink:to="loc_OCXUnderwrittenPublicOfferingMember_60" xlink:type="arc" order="61"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis" xlink:label="loc_srtRangeAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapStatementTable" xlink:to="loc_srtRangeAxis" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember" xlink:label="loc_srtRangeMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_srtRangeAxis" xlink:to="loc_srtRangeMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember" xlink:label="loc_srtMinimumMember_100"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMinimumMember_100" xlink:type="arc" order="101"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember" xlink:label="loc_srtMaximumMember_110"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srtRangeMember" xlink:to="loc_srtMaximumMember_110" xlink:type="arc" order="111"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodSharesNewIssues_150" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssuedPricePerShare" xlink:label="loc_us-gaapSharesIssuedPricePerShare_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharesIssuedPricePerShare_150" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction" xlink:label="loc_us-gaapSaleOfStockConsiderationReceivedOnTransaction_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSaleOfStockConsiderationReceivedOnTransaction_150" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_MinimumBeneficialOwnershipPercentage" xlink:label="loc_OCXMinimumBeneficialOwnershipPercentage_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_OCXMinimumBeneficialOwnershipPercentage_150" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapStockIssuedDuringPeriodValueNewIssues_150" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockNoParValue" xlink:label="loc_us-gaapCommonStockNoParValue_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapCommonStockNoParValue_150" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaapSharePrice_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapSharePrice_150" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_150" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight" xlink:label="loc_us-gaapClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight_150" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProfessionalFees" xlink:label="loc_us-gaapProfessionalFees_150"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapStatementLineItems" xlink:to="loc_us-gaapProfessionalFees_150" xlink:type="arc" order="9"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/LoanPayableToSiliconValleyBankDetailsNarrative" xlink:title="00000070 - Disclosure - Loan Payable to Silicon Valley Bank (Details Narrative)"> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:label="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:label="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xbrldt:contextElement="segment" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:type="arc" order="10" xbrldt:closed="true"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TypeOfArrangementAxis" xlink:label="loc_us-gaapTypeOfArrangementAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapTypeOfArrangementAxis" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember" xlink:label="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapTypeOfArrangementAxis" xlink:to="loc_us-gaapArrangementsAndNonarrangementTransactionsMember_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_AmendedLoanAgreementMember" xlink:label="loc_OCXAmendedLoanAgreementMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXAmendedLoanAgreementMember_0" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_LoanDeferralAgreementMember" xlink:label="loc_OCXLoanDeferralAgreementMember_40"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapArrangementsAndNonarrangementTransactionsMember" xlink:to="loc_OCXLoanDeferralAgreementMember_40" xlink:type="arc" order="41"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaapVestingAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapVestingAxis" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaapVestingDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapVestingAxis" xlink:to="loc_us-gaapVestingDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaapVestingDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapVestingAxis" xlink:to="loc_us-gaapVestingDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember" xlink:label="loc_us-gaapShareBasedCompensationAwardTrancheOneMember_0"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapVestingDomain" xlink:to="loc_us-gaapShareBasedCompensationAwardTrancheOneMember_0" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember" xlink:label="loc_us-gaapShareBasedCompensationAwardTrancheTwoMember_20"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapVestingDomain" xlink:to="loc_us-gaapShareBasedCompensationAwardTrancheTwoMember_20" xlink:type="arc" order="22"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaapStatementEquityComponentsAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapStatementEquityComponentsAxis" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaapEquityComponentDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapStatementEquityComponentsAxis" xlink:to="loc_us-gaapEquityComponentDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_BankWarrantMember" xlink:label="loc_OCXBankWarrantMember_50"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapEquityComponentDomain" xlink:to="loc_OCXBankWarrantMember_50" xlink:type="arc" order="51"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightAxis" xlink:label="loc_us-gaapClassOfWarrantOrRightAxis"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaapScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable" xlink:to="loc_us-gaapClassOfWarrantOrRightAxis" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaapClassOfWarrantOrRightDomain"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaapClassOfWarrantOrRightAxis" xlink:to="loc_us-gaapClassOfWarrantOrRightDomain" xlink:type="arc" order="20"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightDomain" xlink:label="loc_us-gaapClassOfWarrantOrRightDomain_10"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xbrldt:contextElement="segment" xlink:from="loc_us-gaapClassOfWarrantOrRightAxis" xlink:to="loc_us-gaapClassOfWarrantOrRightDomain_10" xlink:type="arc" order="30"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantMember" xlink:label="loc_us-gaapWarrantMember_80"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapClassOfWarrantOrRightDomain" xlink:to="loc_us-gaapWarrantMember_80" xlink:type="arc" order="81"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LinesOfCreditCurrent" xlink:label="loc_us-gaapLinesOfCreditCurrent_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapLinesOfCreditCurrent_120" xlink:type="arc" order="0"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit" xlink:label="loc_us-gaapRepaymentsOfLinesOfCredit_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapRepaymentsOfLinesOfCredit_120" xlink:type="arc" order="1"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid" xlink:label="loc_us-gaapDebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapDebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid_120" xlink:type="arc" order="2"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaapAdditionalPaidInCapital_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapAdditionalPaidInCapital_120" xlink:type="arc" order="3"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd" xlink:label="loc_us-gaapLineOfCreditFacilityInterestRateAtPeriodEnd_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapLineOfCreditFacilityInterestRateAtPeriodEnd_120" xlink:type="arc" order="4"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDateDescription" xlink:label="loc_us-gaapDebtInstrumentMaturityDateDescription_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapDebtInstrumentMaturityDateDescription_120" xlink:type="arc" order="5"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancingReceivableUnamortizedLoanFeeCost" xlink:label="loc_us-gaapFinancingReceivableUnamortizedLoanFeeCost_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapFinancingReceivableUnamortizedLoanFeeCost_120" xlink:type="arc" order="6"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityDescription" xlink:label="loc_us-gaapLineOfCreditFacilityDescription_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapLineOfCreditFacilityDescription_120" xlink:type="arc" order="7"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights" xlink:label="loc_us-gaapClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_120" xlink:type="arc" order="8"/> |
| | <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" xlink:label="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_us-gaapClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_120" xlink:type="arc" order="9"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_PercentageForWarrantExercisePricePerShare" xlink:label="loc_OCXPercentageForWarrantExercisePricePerShare_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXPercentageForWarrantExercisePricePerShare_120" xlink:type="arc" order="10"/> |
| | <link:loc xlink:type="locator" xlink:href="ocx-20211231.xsd#OCX_DilutedEquityOutstanding" xlink:label="loc_OCXDilutedEquityOutstanding_120"/> |
| | <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaapCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems" xlink:to="loc_OCXDilutedEquityOutstanding_120" xlink:type="arc" order="11"/> |
| | </link:definitionLink> |
| <link:definitionLink xlink:type="extended" xlink:role="http://oncocyte.com/role/ScheduleOfQuarterlyFinancialInformationDetails" xlink:title="00000071 - Disclosure - Schedule of Quarterly Financial Information (Details)"/> |
| </link:linkbase> |