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  <xsd:element name="WarrantsNotAssumedInMergerExpiringAugust2022GroupMember" id="prpo_WarrantsNotAssumedInMergerExpiringAugust2022GroupMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsNotAssumedInMergerExpiringAugust2022GroupBMember" id="prpo_WarrantsNotAssumedInMergerExpiringAugust2022GroupBMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsNotAssumedInMergerExpiringAugust2022GroupCMember" id="prpo_WarrantsNotAssumedInMergerExpiringAugust2022GroupCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsNotAssumedInMergerExpiringAugust2022GroupDMember" id="prpo_WarrantsNotAssumedInMergerExpiringAugust2022GroupDMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsNotAssumedInMergerExpiringOctober2022Member" id="prpo_WarrantsNotAssumedInMergerExpiringOctober2022Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsNotAssumedInMergerExpiringOctober2022GroupBMember" id="prpo_WarrantsNotAssumedInMergerExpiringOctober2022GroupBMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsNotAssumedInMergerExpiringOctober2022GroupCMember" id="prpo_WarrantsNotAssumedInMergerExpiringOctober2022GroupCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsCanceledInSettlementAgreement" id="prpo_WarrantsCanceledInSettlementAgreement" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantLiabilitiesMember" id="prpo_WarrantLiabilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantLiability2018Member" id="prpo_WarrantLiability2018Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element id="prpo_TotalGainsOrLossesAbstract" name="TotalGainsOrLossesAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element name="ScheduleOfGrossToNetSalesAdjustmentsTableTextBlock" id="prpo_ScheduleOfGrossToNetSalesAdjustmentsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfAllowanceForDoubtfulAccountsTableTextBlock" id="prpo_ScheduleOfAllowanceForDoubtfulAccountsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TermLoanMember" id="prpo_TermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrossProceedsFromGrantReceivedAndLoan" id="prpo_GrossProceedsFromGrantReceivedAndLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <element id="prpo_LiabilityForSettlementOfCommonStockWarrantLiability" name="LiabilityForSettlementOfCommonStockWarrantLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element name="SettlementAgreementMember" id="prpo_SettlementAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConvertibleBridgeNotesMember" id="prpo_ConvertibleBridgeNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element id="prpo_DiscountPercentage" name="DiscountPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element name="LincolnParkMember" id="prpo_LincolnParkMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Quarter32018WarrantsMember" id="prpo_Quarter32018WarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOfStockNumberOfSharesIssuedInTransactionSubjectToMarketPrice" id="prpo_SaleOfStockNumberOfSharesIssuedInTransactionSubjectToMarketPrice" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumPercentageOfSharesIssuedOnOutstandingNasdaqStockExchangeRules" id="prpo_MaximumPercentageOfSharesIssuedOnOutstandingNasdaqStockExchangeRules" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumNumberOfSharesIssuedOnOutstanding" id="prpo_MaximumNumberOfSharesIssuedOnOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <element id="prpo_ReductionOfDebtDiscountAndDebtIssuanceCostFromDebt" name="ReductionOfDebtDiscountAndDebtIssuanceCostFromDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <xsd:element name="Quarter32018WarrantsFirstHalfMember" id="prpo_Quarter32018WarrantsFirstHalfMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Quarter32018WarrantsSecondHalfMember" id="prpo_Quarter32018WarrantsSecondHalfMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BridgeNotesRedemptionFeatureMember" id="prpo_BridgeNotesRedemptionFeatureMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOptionMember" id="prpo_ConversionOptionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <element id="prpo_Quarter42018WarrantsMember" name="Quarter42018WarrantsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdjustmentsToAdditionalPaidInCapitalWarrantModificationRecordedAsDebtDiscount" name="AdjustmentsToAdditionalPaidInCapitalWarrantModificationRecordedAsDebtDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffBeneficialConversionFeatureOnExtinguishmentOfConvertibleNotes" name="AdjustmentsToAdditionalPaidInCapitalWriteOffBeneficialConversionFeatureOnExtinguishmentOfConvertibleNotes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffDebtDiscountsPremium" name="AdjustmentsToAdditionalPaidInCapitalWriteOffDebtDiscountsPremium" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffDebtDerivativeLiability" name="AdjustmentsToAdditionalPaidInCapitalWriteOffDebtDerivativeLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_GainLossOnExtinguishmentOfConvertibleNotes" name="GainLossOnExtinguishmentOfConvertibleNotes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringNovember2023Member" name="WarrantsNotAssumedInMergerExpiringNovember2023Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringDecember2023Member" name="WarrantsNotAssumedInMergerExpiringDecember2023Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringAugust2022GroupEMember" name="WarrantsNotAssumedInMergerExpiringAugust2022GroupEMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringAugust2022GroupFMember" name="WarrantsNotAssumedInMergerExpiringAugust2022GroupFMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringJune2022GroupCMember" name="WarrantsNotAssumedInMergerExpiringJune2022GroupCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmendmentAndRestatementAgreementMember" name="AmendmentAndRestatementAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendsAxis" name="DeemedDividendsAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendsNameDomain" name="DeemedDividendsNameDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendMember" name="DeemedDividendMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendBMember" name="DeemedDividendBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendKMember" name="DeemedDividendKMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendCMember" name="DeemedDividendCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DeemedDividendDMember" name="DeemedDividendDMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DebtInstrumentConvertibleConversionPriceAboveClosingBidPricePercent" name="DebtInstrumentConvertibleConversionPriceAboveClosingBidPricePercent" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PercentageOfDailyAverageCompositeTradingVolume" name="PercentageOfDailyAverageCompositeTradingVolume" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DebtInstrumentConvertibleConversionPriceFloor" name="DebtInstrumentConvertibleConversionPriceFloor" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_BridgeNotesBeneficialConversionFeaturesMember" name="BridgeNotesBeneficialConversionFeaturesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdjustmentsToAdditionalPaidInCapitalWriteOffDebtPremium" name="AdjustmentsToAdditionalPaidInCapitalWriteOffDebtPremium" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_Quarter42018BridgeNotesMember" name="Quarter42018BridgeNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AllowanceForDoubtfulAccountsRevenue" name="AllowanceForDoubtfulAccountsRevenue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ServiceRevenueNetMember" name="ServiceRevenueNetMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_OtherMember" name="OtherMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ContractualAllowanceAndAdjustments" name="ContractualAllowanceAndAdjustments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffOfBeneficialConversionFeatureInConjunctionWithConvertibleNoteExtinguishment" name="WriteOffOfBeneficialConversionFeatureInConjunctionWithConvertibleNoteExtinguishment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffOfDebtDiscountsNetOfDebtPremiumsInConjunctionWithConvertibleNoteConversions" name="WriteOffOfDebtDiscountsNetOfDebtPremiumsInConjunctionWithConvertibleNoteConversions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffOfDerivativeLiabilityInConjunctionWithConvertibleNoteConversions" name="WriteOffOfDerivativeLiabilityInConjunctionWithConvertibleNoteConversions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtDiscountDuringYearTwo" name="AmortizationOfDebtDiscountDuringYearTwo" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtDiscountDuringNextTwelveMonths" name="AmortizationOfDebtDiscountDuringNextTwelveMonths" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtDiscountDuringYearThree" name="AmortizationOfDebtDiscountDuringYearThree" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtDiscountDuringYearFour" name="AmortizationOfDebtDiscountDuringYearFour" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtDiscountDuringYearFive" name="AmortizationOfDebtDiscountDuringYearFive" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtPremium" name="AmortizationOfDebtPremium" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmortizationOfDebtDiscount" name="AmortizationOfDebtDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ConvertiblePromissoryNotesExchangeNotesMember" name="ConvertiblePromissoryNotesExchangeNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_LeaseDisclosureTextBlock" name="LeaseDisclosureTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_LesseeBalanceSheetInformationTableTextBlock" name="LesseeBalanceSheetInformationTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_OperatingAndFinanceLeaseRightOfUseAsset" name="OperatingAndFinanceLeaseRightOfUseAsset" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_OperatingAndFinanceLeaseLiability" name="OperatingAndFinanceLeaseLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_OperatingAndFinanceLeaseLiabilitiesPaymentsDueAbstract" name="OperatingAndFinanceLeaseLiabilitiesPaymentsDueAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_FinanceLeaseCost" name="FinanceLeaseCost" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffOfDebtPremium" name="WriteOffOfDebtPremium" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ScheduleOfDebtDiscountsAndDebtPremiumsTableTextBlock" name="ScheduleOfDebtDiscountsAndDebtPremiumsTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffOfDebtDiscount" name="WriteOffOfDebtDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_LesseeWeightedAverageLeaseTermAndDiscountRateTableTextBlock" name="LesseeWeightedAverageLeaseTermAndDiscountRateTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DebtInstrumentDiscountPercentage" name="DebtInstrumentDiscountPercentage" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_May2019WarrantsMember" name="May2019WarrantsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ScheduleOfReportedRevenuesNetOfCollectionAllowanceTableTextBlock" name="ScheduleOfReportedRevenuesNetOfCollectionAllowanceTableTextBlock" nillable="true" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DepartmentOfEconomicAndCommunityDevelopmentMember" name="DepartmentOfEconomicAndCommunityDevelopmentMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_MaximumBeneficialOwnershipPercentageOutstandingShares" name="MaximumBeneficialOwnershipPercentageOutstandingShares" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ConversionOfStockPerShareConversionPrice" name="ConversionOfStockPerShareConversionPrice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_OperatingLeaseRightOfUseAssetAmortization" name="OperatingLeaseRightOfUseAssetAmortization" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_IncreaseDecreaseInOperatingLeaseLiabilities" name="IncreaseDecreaseInOperatingLeaseLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmountsIncludedInMeasurementOfLeaseLiabilities" name="AmountsIncludedInMeasurementOfLeaseLiabilities" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DebtInstrumentConversionPriceAchievementRepaymentPeriodFromDateOfIssuance" name="DebtInstrumentConversionPriceAchievementRepaymentPeriodFromDateOfIssuance" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_OperatingLeaseNumberOfOptionsToRenew" name="OperatingLeaseNumberOfOptionsToRenew" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_IntrinsicValueOfWarrantsExercised" name="IntrinsicValueOfWarrantsExercised" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PayerTypeRevenueSourceAxis" name="PayerTypeRevenueSourceAxis" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PayerTypeRevenueSourceDomain" name="PayerTypeRevenueSourceDomain" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PayerTypeSelfPayMember" name="PayerTypeSelfPayMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PayerTypeThirdPartyPayerMember" name="PayerTypeThirdPartyPayerMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_IncreaseDecreaseInDeferredRentAndPrepaidExpenses" name="IncreaseDecreaseInDeferredRentAndPrepaidExpenses" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_April2019BridgeNotesMember" name="April2019BridgeNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringApril2024Member" name="WarrantsNotAssumedInMergerExpiringApril2024Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringMay2024Member" name="WarrantsNotAssumedInMergerExpiringMay2024Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_GainLossOnModificationOfWarrants" name="GainLossOnModificationOfWarrants" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_May2019BridgeNotesMember" name="May2019BridgeNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringApril2023GroupMember" name="WarrantsNotAssumedInMergerExpiringApril2023GroupMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringApril2023GroupBMember" name="WarrantsNotAssumedInMergerExpiringApril2023GroupBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringJuly2023GroupBMember" name="WarrantsNotAssumedInMergerExpiringJuly2023GroupBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringJuly2023GroupMember" name="WarrantsNotAssumedInMergerExpiringJuly2023GroupMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringAugust2023GroupMember" name="WarrantsNotAssumedInMergerExpiringAugust2023GroupMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringAugust2023GroupBMember" name="WarrantsNotAssumedInMergerExpiringAugust2023GroupBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringSeptember2023GroupBMember" name="WarrantsNotAssumedInMergerExpiringSeptember2023GroupBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WarrantsNotAssumedInMergerExpiringSeptember2023GroupMember" name="WarrantsNotAssumedInMergerExpiringSeptember2023GroupMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdditionsOfUnamortizedDiscount" name="AdditionsOfUnamortizedDiscount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_FractionalCommonStockValue" name="FractionalCommonStockValue" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_FractionalCommonStockShares" name="FractionalCommonStockShares" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PaymentOfFractionalCommonShares" name="PaymentOfFractionalCommonShares" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_InitialValuationOfDerivativeLiabilityRecordedInConjunctionWithIssuanceOfConvertibleNotes" name="InitialValuationOfDerivativeLiabilityRecordedInConjunctionWithIssuanceOfConvertibleNotes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffWarrantLiabilityInConjunctionWithWarrantExercises" name="WriteOffWarrantLiabilityInConjunctionWithWarrantExercises" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ConvertibleNotes" name="ConvertibleNotes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AmendedApril2018WarrantsMember" name="AmendedApril2018WarrantsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_LossOnModificationOfWarrants" name="LossOnModificationOfWarrants" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_EquityPurchaseAgreementValueRemainingAvailable" name="EquityPurchaseAgreementValueRemainingAvailable" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_JesseCambellLawsuitMember" name="JesseCambellLawsuitMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ExpectedAmountToBePaidByInsuranceCompany" name="ExpectedAmountToBePaidByInsuranceCompany" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_LossOnLitigation" name="LossOnLitigation" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_CustomerMember" name="CustomerMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_CustomerBMember" name="CustomerBMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ModifiedExercisePrice" name="ModifiedExercisePrice" nillable="true" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_CustomerCMember" name="CustomerCMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_WriteOffOfDebtDiscountRelatingToNoteExtinguishment" name="WriteOffOfDebtDiscountRelatingToNoteExtinguishment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AdditionsOfUnamortizedPremiums" name="AdditionsOfUnamortizedPremiums" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_BeneficialConversionFeatureOnIssuanceOfDebt" name="BeneficialConversionFeatureOnIssuanceOfDebt" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DebtDiscountDuringNonCashOrPartialNonCashTransaction" name="DebtDiscountDuringNonCashOrPartialNonCashTransaction" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_Lp2020PurchaseAgreementMember" name="Lp2020PurchaseAgreementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ClosingSalePriceAbove1.00Member" name="ClosingSalePriceAbove1.00Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ClosingSalePriceAbove1.50Member" name="ClosingSalePriceAbove1.50Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_GuaranteedInterestTerm" name="GuaranteedInterestTerm" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_CustomerDMember" name="CustomerDMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_DebtConversionConvertedInstrumentInterestAmount" name="DebtConversionConvertedInstrumentInterestAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_SharesRepurchaseSalePriceOfCommonStockToRemainAsTargetedBusinessDaysPriorToPurchaseDate" name="SharesRepurchaseSalePriceOfCommonStockToRemainAsTargetedBusinessDaysPriorToPurchaseDate" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_ClassOfWarrantOrRightExpired" name="ClassOfWarrantOrRightExpired" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PaycheckProtectionProgramMember" name="PaycheckProtectionProgramMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PopularHealthcarePllcMember" name="PopularHealthcarePllcMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PaymentDeferralPeriod" name="PaymentDeferralPeriod" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_April2019BridgeNotesAndMay2019BridgeNotesMember" name="April2019BridgeNotesAndMay2019BridgeNotesMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_LevistonNoteMember" name="LevistonNoteMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_MaximumAggregateInitialOfferingPrice" name="MaximumAggregateInitialOfferingPrice" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_CustomerEMember" name="CustomerEMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_AccruedInterest" name="AccruedInterest" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PurchasePriceOfAllShareInJointVenture" name="PurchasePriceOfAllShareInJointVenture" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="prpo_PoplarPutRightMember" name="PoplarPutRightMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
