{
    "resourceType": "Specimen",
    "id": "Specimen-PatrickSammyBloodEDTA-Example",
    "extension":  [
        {
            "url": "https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-SampleCategory",
            "valueCodeableConcept": {
                "coding":  [
                    {
                        "system": "https://fhir.hl7.org.uk/CodeSystem/UKCore-SampleCategory",
                        "code": "germline",
                        "display": "Germline"
                    }
                ]
            }
        }
    ],
    "identifier":  [
        {
            "system": "https://fhir.add.nhs.uk/Id/specimenId",
            "value": "RGT03135A"
        }
    ],
    "status": "unavailable",
    "type": {
        "coding":  [
            {
                "system": "http://snomed.info/sct",
                "code": "445295009",
                "display": "Blood specimen with EDTA"
            }
        ]
    },
    "subject": {
        "reference": "Patient/Patient-PatrickSammy-Example",
        "identifier": {
            "system": "https://fhir.nhs.uk/Id/nhs-number",
            "value": "9449307873"
        }
    },
    "request":  [
        {
            "reference": "ServiceRequest/ServiceRequest-WGSTestOrderForm-CancerHaemOnc-Example"
        }
    ],
    "collection": {
        "collectedDateTime": "09/11/2023 09:00:00",
        "quantity": {
            "system": "http://unitsofmeasure.org",
            "code": "mL",
            "value": 2.5
        }
    }
}

<Specimen xmlns="http://hl7.org/fhir">
    <id value="Specimen-PatrickSammyBloodEDTA-Example" />
    <extension url="https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-SampleCategory">
        <valueCodeableConcept>
            <coding>
                <system value="https://fhir.hl7.org.uk/CodeSystem/UKCore-SampleCategory" />
                <code value="germline" />
                <display value="Germline" />
            </coding>
        </valueCodeableConcept>
    </extension>
    <identifier>
        <system value="https://fhir.add.nhs.uk/Id/specimenId" />
        <value value="RGT03135A" />
    </identifier>
    <status value="unavailable" />
    <type>
        <coding>
            <system value="http://snomed.info/sct" />
            <code value="445295009" />
            <display value="Blood specimen with EDTA" />
        </coding>
    </type>
    <subject>
        <reference value="Patient/Patient-PatrickSammy-Example" />
        <identifier>
            <system value="https://fhir.nhs.uk/Id/nhs-number" />
            <value value="9449307873" />
        </identifier>
    </subject>
    <request>
        <reference value="ServiceRequest/ServiceRequest-WGSTestOrderForm-CancerHaemOnc-Example" />
    </request>
    <collection>
        <collectedDateTime value="2023-09-11T09:00:00Z" />
        <quantity>
            <value value="2.5" />
            <system value="http://unitsofmeasure.org" />
            <code value="mL" />
        </quantity>
    </collection>
</Specimen>

Propose a change to Specimen-PatrickSammyBloodEDTA-Example