<Observation xmlns="http://hl7.org/fhir">
    <id value="Pathology-Observation-HBsAg-Example" />
    <meta>
        <profile value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-Observation-Lab" />
    </meta>
    <identifier>
        <system value="https://tools.ietf.org/html/rfc4122" />
        <value value="cca2b653-b6dd-4bf3-8337-10b140d50972" />
    </identifier>
    <status value="final" />
    <category>
        <coding>
            <system value="http://terminology.hl7.org/CodeSystem/observation-category" />
            <code value="laboratory" />
            <display value="Laboratory" />
        </coding>
    </category>
    <code>
        <!--  Equivalent codes from the PBCL and PaLM SNOMED CT reference sets are used in this example.  -->
        <!--  In practice, it is likely that only a code from one reference set will be carried.  -->
        <coding>
            <!--  From PBCL observable entity reference set  -->
            <system value="http://snomed.info/sct" />
            <code value="1014211000000100" />
            <display value="Hepatitis B surface antigen level" />
        </coding>
        <coding>
            <!--  From PaLM observable entity reference set  -->
            <system value="http://snomed.info/sct" />
            <code value="51061000237103" />
            <display value="Hepatitis B surface antigen in serum qualitative result" />
        </coding>
    </code>
    <subject>
        <reference value="urn:uuid:ab87a3f8-1d37-44a9-804e-5e962598a6e4" />
        <display value="MOXEY, Judy" />
    </subject>
    <issued value="2022-02-25T13:47:00+00:00" />
    <performer>
        <reference value="urn:uuid:8a6d85b8-9837-4fed-a257-4cf207988338" />
        <display value="TD008362 PATH LAB 001" />
    </performer>
    <valueCodeableConcept>
        <coding>
            <system value="http://snomed.info/sct" />
            <code value="260385009" />
            <display value="Negative" />
        </coding>
    </valueCodeableConcept>
    <specimen>
        <reference value="urn:uuid:bab0eaec-1ec5-4598-b660-90bb38a1030d" />
    </specimen>
</Observation>

{
    "resourceType": "Observation",
    "id": "Pathology-Observation-HBsAg-Example",
    "meta": {
        "profile":  [
            "https://fhir.hl7.org.uk/StructureDefinition/UKCore-Observation-Lab"
        ]
    },
    "identifier":  [
        {
            "system": "https://tools.ietf.org/html/rfc4122",
            "value": "cca2b653-b6dd-4bf3-8337-10b140d50972"
        }
    ],
    "status": "final",
    "category":  [
        {
            "coding":  [
                {
                    "system": "http://terminology.hl7.org/CodeSystem/observation-category",
                    "code": "laboratory",
                    "display": "Laboratory"
                }
            ]
        }
    ],
    "code": {
        "coding":  [
            {
                "system": "http://snomed.info/sct",
                "code": "1014211000000100",
                "display": "Hepatitis B surface antigen level"
            },
            {
                "system": "http://snomed.info/sct",
                "code": "51061000237103",
                "display": "Hepatitis B surface antigen in serum qualitative result"
            }
        ]
    },
    "subject": {
        "reference": "urn:uuid:ab87a3f8-1d37-44a9-804e-5e962598a6e4",
        "display": "MOXEY, Judy"
    },
    "issued": "2022-02-25T13:47:00+00:00",
    "performer":  [
        {
            "reference": "urn:uuid:8a6d85b8-9837-4fed-a257-4cf207988338",
            "display": "TD008362 PATH LAB 001"
        }
    ],
    "valueCodeableConcept": {
        "coding":  [
            {
                "system": "http://snomed.info/sct",
                "code": "260385009",
                "display": "Negative"
            }
        ]
    },
    "specimen": {
        "reference": "urn:uuid:bab0eaec-1ec5-4598-b660-90bb38a1030d"
    }
}