{
  "resourceType": "StructureDefinition",
  "url": "https://fhir.nhs.uk/StructureDefinition/Extension-NHSEngland-GestationPeriodObservation",
  "name": "GestationPeriodObservation",
  "status": "draft",
  "date": "2022-09-14T14:21:48.4837633+00:00",
  "fhirVersion": "4.0.1",
  "kind": "complex-type",
  "abstract": false,
  "context": [
    {
      "type": "element",
      "expression": "Patient"
    }
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "https://fhir.nhs.uk/StructureDefinition/Extension-NHSEngland-GestationPeriodObservation"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "type": [
          {
            "code": "Reference",
            "targetProfile": [
              "https://fhir.hl7.org.uk/StructureDefinition/UKCore-Observation"
            ],
            "aggregation": [
              "referenced"
            ]
          }
        ]
      }
    ]
  }
}