<Observation xmlns="http://hl7.org/fhir">
    <id value="BP10001" />
    <identifier>
        <use value="usual" />
        <type>
            <coding>
                <system value="http://terminology.hl7.org/CodeSystem/v2-0203" />
                <code value="U" />
                <display value="source system ID" />
            </coding>
        </type>
        <system value="http://mco.smarthealth.org" />
        <value value="CN12345678O" />
        <period>
            <start value="2001-05-06" />
        </period>
    </identifier>
    <status value="final" />
    <code>
        <coding>
            <system value="http://loinc.org" />
            <code value="8462-4" />
            <display value="Diastolic blood pressure" />
        </coding>
        <text value="Blood pressure diastolic" />
    </code>
    <subject>
        <reference value="PatientNYC1001" />
        <display value="Sample member" />
    </subject>
    <encounter>
        <reference value="encounter 200020" />
    </encounter>
    <effectiveDateTime value="2022-04-05" />
    <performer>
        <reference value="AZ10003" />
        <display value="Dr. Alex Tan" />
    </performer>
    <valueQuantity>
        <value value="80" />
        <unit value="mmHg" />
        <system value="http://unitsofmeasure.org" />
        <code value="mm[Hg]" />
    </valueQuantity>
</Observation>