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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2021-03-19T22:17:27.8506877+00:00 -->
<!-- Version            : 5.0.1.571 -->
<!-- Package ID         : e83ba29eab8f40dd93323f96c7150acf -->
<!-- Copyright (c) 2021 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="om_StockIssuedDuringPeriodShareRedeemableConvertiblePreferredStockWarrants" name="StockIssuedDuringPeriodShareRedeemableConvertiblePreferredStockWarrants" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_TemporaryEquityCashExercisesOfRedeemableConvertiblePreferredStockWarrantsShares" name="TemporaryEquityCashExercisesOfRedeemableConvertiblePreferredStockWarrantsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_TemporaryEquityCashExercisesOfRedeemableConvertiblePreferredStockWarrantsValue" name="TemporaryEquityCashExercisesOfRedeemableConvertiblePreferredStockWarrantsValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_ConversionOfRedeemableConvertiblePreferredStockWarrantsToCommonStockWarrantsValue" name="ConversionOfRedeemableConvertiblePreferredStockWarrantsToCommonStockWarrantsValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_TemporaryEquitySharesConversionOfConvertibleRedeemablePreferredStockIntoCommonStock" name="TemporaryEquitySharesConversionOfConvertibleRedeemablePreferredStockIntoCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_TemporaryEquityConversionOfConvertibleRedeemablePreferredStockIntoCommonStock" name="TemporaryEquityConversionOfConvertibleRedeemablePreferredStockIntoCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_NonCashLeaseExpense" name="NonCashLeaseExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_NonCashInterestExpense" name="NonCashInterestExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_ProvisionForInventories" name="ProvisionForInventories" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_IncreaseDecreaseInAccruedWarrantyLiability" name="IncreaseDecreaseInAccruedWarrantyLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_IncreaseDecreaseInOperatingLeaseLiabilities" name="IncreaseDecreaseInOperatingLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_ProceedsFromIssuanceOfCashExerciseOfRedeemableConvertiblePreferredStockWarrant" name="ProceedsFromIssuanceOfCashExerciseOfRedeemableConvertiblePreferredStockWarrant" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_RepaymentOfTermLoanAndExtinguishmentCosts" name="RepaymentOfTermLoanAndExtinguishmentCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_PaymentOfRedeemableConvertiblePreferredStockIssuanceCosts" name="PaymentOfRedeemableConvertiblePreferredStockIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_CashPaidForAmountsIncludedInMeasurementOfOperatingLeaseLiabilities" name="CashPaidForAmountsIncludedInMeasurementOfOperatingLeaseLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_CapitalExpendituresIncludedInAccountsPayableAndAccruedExpenses" name="CapitalExpendituresIncludedInAccountsPayableAndAccruedExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_TransferOfPropertyAndEquipmentToInventories" name="TransferOfPropertyAndEquipmentToInventories" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_AdjustmentToRedemptionValueOnRedeemableConvertiblePreferredStock" name="AdjustmentToRedemptionValueOnRedeemableConvertiblePreferredStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_ConversionOfRedeemableConvertiblePreferredStockIntoCommonStockUponInitialPublicOffering" name="ConversionOfRedeemableConvertiblePreferredStockIntoCommonStockUponInitialPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_ReclassificationOfRedeemableConvertiblePreferredStockWarrantLiabilityForConversionOfSeriesaWarrantsIntoCommonStockWarrants" name="ReclassificationOfRedeemableConvertiblePreferredStockWarrantLiabilityForConversionOfSeriesaWarrantsIntoCommonStockWarrants" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_ReclassificationOfRedeemableConvertiblePreferredStockWarrantLiabilityToAdditionalPaidInCapital" name="ReclassificationOfRedeemableConvertiblePreferredStockWarrantLiabilityToAdditionalPaidInCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_RedeemableConvertiblePreferredStockAndStockholdersEquityDeficitTextBlock" name="RedeemableConvertiblePreferredStockAndStockholdersEquityDeficitTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ContractLiabilitiesDeferredRevenuePolicyTextBlock" name="ContractLiabilitiesDeferredRevenuePolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ScheduleOfCashCashEquivalentsAndRestrictedCashTableTextBlock" name="ScheduleOfCashCashEquivalentsAndRestrictedCashTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_OperatingLeasePaymentsMaturityTableTextBlock" name="OperatingLeasePaymentsMaturityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ScheduleOfContractWithCustomerLiabilityTableTextBlock" name="ScheduleOfContractWithCustomerLiabilityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock" name="ScheduleOfAccruedExpensesAndOtherCurrentLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_LeaseRelatedAssetsAndLiabilitiesTableTextBlock" name="LeaseRelatedAssetsAndLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" name="ScheduleOfWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_SummaryOfReservedSharesOfCommonStockOnConvertedBasisForIssuanceTableTextBlock" name="SummaryOfReservedSharesOfCommonStockOnConvertedBasisForIssuanceTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_EmployeesStockPurchasePlanMember" name="EmployeesStockPurchasePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_DescriptionOfBusinessLineItems" name="DescriptionOfBusinessLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_DescriptionOfBusinessTable" name="DescriptionOfBusinessTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_UnderwritersMember" name="UnderwritersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_OfferingCostsUnderwritingDiscountsAndCommissionsExpenses" name="OfferingCostsUnderwritingDiscountsAndCommissionsExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_CashCashEquivalentsRestrictedCashAndShortTermInvestments" name="CashCashEquivalentsRestrictedCashAndShortTermInvestments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_SummaryOfSignificantAccountingPoliciesLineItems" name="SummaryOfSignificantAccountingPoliciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_CustomerOneMember" name="CustomerOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_CustomerTwoMember" name="CustomerTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_CustomerThreeMember" name="CustomerThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_CustomerFourMember" name="CustomerFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_ConcentrationRiskNumberOfMajorCustomers" name="ConcentrationRiskNumberOfMajorCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_WarrantyPeriod" name="WarrantyPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_CapitalizedContractCostAmortizationPeriodDescription" name="CapitalizedContractCostAmortizationPeriodDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ConsolesProductMember" name="ConsolesProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_ConsumablesProductMember" name="ConsumablesProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_OperatingLeaseArrangementsMember" name="OperatingLeaseArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_OperatingLeaseArrangementsMinimumLeasePaymentsDueNextTwelveMonths" name="OperatingLeaseArrangementsMinimumLeasePaymentsDueNextTwelveMonths" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_OperatingLeaseArrangementsMinimumLeasePaymentsDueYearTwo" name="OperatingLeaseArrangementsMinimumLeasePaymentsDueYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_OperatingLeaseArrangementsMinimumLeasePaymentsDue" name="OperatingLeaseArrangementsMinimumLeasePaymentsDue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_RedeemableConvertiblePreferredStockWarrantLiabilityMember" name="RedeemableConvertiblePreferredStockWarrantLiabilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_FinancialLiabilitiesAmortizedCosts" name="FinancialLiabilitiesAmortizedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_AvailableForSaleDebtSecuritiesMaturityTerms" name="AvailableForSaleDebtSecuritiesMaturityTerms" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_TablosUnderOperatingLeasesMember" name="TablosUnderOperatingLeasesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_AccruedInventoryCurrent" name="AccruedInventoryCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_AccruedResearchAndDevelopmentExpenses" name="AccruedResearchAndDevelopmentExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_LesseeOperatingLeaseCommencementMonthAndYear" name="LesseeOperatingLeaseCommencementMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_LesseeOperatingLeaseExpirationMonthAndYear" name="LesseeOperatingLeaseExpirationMonthAndYear" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_CommitmentsAndContingenciesLineItems" name="CommitmentsAndContingenciesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_CommitmentsAndContingenciesTable" name="CommitmentsAndContingenciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_OperatingAndFinanceLeaseRightOfUseAssets" name="OperatingAndFinanceLeaseRightOfUseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_OperatingAndFinanceLeaseLiability" name="OperatingAndFinanceLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_FinanceLeaseCostsAbstract" name="FinanceLeaseCostsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_OperatingLeasesAbstract" name="OperatingLeasesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_FinanceLeaseAbstract" name="FinanceLeaseAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_PerceptiveTermLoanMember" name="PerceptiveTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_SiliconValleyBankTermLoanMember" name="SiliconValleyBankTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_PaymentForDebtPrepaymentAccruedInterestAndExitFees" name="PaymentForDebtPrepaymentAccruedInterestAndExitFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_DebtInstrumentInterestOnlyPaymentsYearAndMonth" name="DebtInstrumentInterestOnlyPaymentsYearAndMonth" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_DebtInstrumentPrincipalPaymentTermAfterInterestOnlyPeriodExpires" name="DebtInstrumentPrincipalPaymentTermAfterInterestOnlyPeriodExpires" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_DebtInstrumentPrepaymentFeePercentage" name="DebtInstrumentPrepaymentFeePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_PercentageOfLimitationOnPledgesOfCapitalStockOfForeignSubsidiaries" name="PercentageOfLimitationOnPledgesOfCapitalStockOfForeignSubsidiaries" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="om_OtherDebtIssuanceCosts" name="OtherDebtIssuanceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_LongTermDebtFutureMinimumPaymentsDue" name="LongTermDebtFutureMinimumPaymentsDue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="om_StockIssuedDuringPeriodSharesIssuedOnExerciseOfWarrants" name="StockIssuedDuringPeriodSharesIssuedOnExerciseOfWarrants" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_SeriesARedeemableConvertiblePreferredStockWarrantsMember" name="SeriesARedeemableConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_SeriesBRedeemableConvertiblePreferredStockWarrantsMember" name="SeriesBRedeemableConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_SeriesCRedeemableConvertiblePreferredStockWarrantsMember" name="SeriesCRedeemableConvertiblePreferredStockWarrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_ConversionOfRedeemableConvertiblePreferredStockWarrantsToCommonStockWarrantsShares" name="ConversionOfRedeemableConvertiblePreferredStockWarrantsToCommonStockWarrantsShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_CommonStockWarrantsExpirationDate" name="CommonStockWarrantsExpirationDate" type="xbrli:gYearMonthItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ReclassificationOfPreferredStockWarrantLiabilityToAdditionalPaidInCapital" name="ReclassificationOfPreferredStockWarrantLiabilityToAdditionalPaidInCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_ConversionOfRedeemableConvertiblePreferredStockWarrantsToCommonStock" name="ConversionOfRedeemableConvertiblePreferredStockWarrantsToCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_WarrantsIssuedToPurchaseCommonStock" name="WarrantsIssuedToPurchaseCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_WarrantsIssuedToPurchaseCommonStockValue" name="WarrantsIssuedToPurchaseCommonStockValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="om_WarrantsIssuedToPurchaseCommonStockPricePerShare" name="WarrantsIssuedToPurchaseCommonStockPricePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_WarrantsToPurchaseCommonStockMember" name="WarrantsToPurchaseCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_StockOptionsOutstandingMember" name="StockOptionsOutstandingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_RestrictedStockUnitsOutstandingMember" name="RestrictedStockUnitsOutstandingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_PerformanceStockUnitsOutstandingMember" name="PerformanceStockUnitsOutstandingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_SharesAvailableForFuturePurchaseUnderESPPMember" name="SharesAvailableForFuturePurchaseUnderESPPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_SharesAvailableForFutureGrantUnderTwoThousandAndTwentyPlanMember" name="SharesAvailableForFutureGrantUnderTwoThousandAndTwentyPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_TwoThousandTwentyEquityIncentivePlanMember" name="TwoThousandTwentyEquityIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_EmployeeStockOptionExcludingMarketAndPerformanceConditionMember" name="EmployeeStockOptionExcludingMarketAndPerformanceConditionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_EmployeesAndExecutiveOfficersMember" name="EmployeesAndExecutiveOfficersMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_PerformanceStockUnitsMember" name="PerformanceStockUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantDateFairValue" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_EquityIncentivePlanLineItems" name="EquityIncentivePlanLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_EquityIncentivePlanTable" name="EquityIncentivePlanTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_PerformanceBasedUnitsApprovedBasedOnPerformanceRelativeToSpecifiedRevenueTargets" name="PerformanceBasedUnitsApprovedBasedOnPerformanceRelativeToSpecifiedRevenueTargets" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ShareBasedCompensationArrangementByShareBasedPaymentAwardInitialOfferingDate" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardInitialOfferingDate" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsEstimatedGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_NumberOfCommonStockSharesPurchasedPursuantToEmployeeStockPurchasePlan" name="NumberOfCommonStockSharesPurchasedPursuantToEmployeeStockPurchasePlan" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="om_IncomeTaxesLineItems" name="IncomeTaxesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_IncomeTaxesTable" name="IncomeTaxesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_EffectiveIncomeTaxRateReconciliationNondeductiblePermanentExpenses" name="EffectiveIncomeTaxRateReconciliationNondeductiblePermanentExpenses" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_NetOperatingLossCarryforwardsLatestExpirationYear" name="NetOperatingLossCarryforwardsLatestExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_OperatingLossCarryforwardsAmountExpired" name="OperatingLossCarryforwardsAmountExpired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="om_TaxCreditCarryForwardExpirationYear" name="TaxCreditCarryForwardExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_IncomeTaxExaminationOpenYearsForExamination" name="IncomeTaxExaminationOpenYearsForExamination" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="om_StockOptionsToPurchaseCommonStockMember" name="StockOptionsToPurchaseCommonStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="om_WarrantsToPurchaseRedeemableConvertiblePreferredStockMember" name="WarrantsToPurchaseRedeemableConvertiblePreferredStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
