{
  "resourceType": "Observation",
  "id": "observation-estimated-date-birth-last-period-example",
  "meta": {
    "versionId": "1",
    "lastUpdated": "2019-12-27T16:13:03Z",
    "profile": [
      "http://hl7.org.au/fhir/ch/v1/StructureDefinition/ncdhc-observation-estimated-date-birth-last-period"
    ]
  },
  "status": "final",
  "code": {
    "coding": [
      {
        "system": "http://snomed.info/sct",
    "code": "289206005"
      }
    ],
    "text": "Estimated date of birth from last known menstrual period"
  },
  "subject": {
    "reference": "Patient/ncdhc-patient-expectant-mother-example",
    "display": "Eve Bill"
  },
  "effectiveDateTime": "2019-12-24",
  "performer": [
    {
      "reference": "Practitioner/examiner-practitioner",
      "display": "Examiner"
    },
    {
      "reference": "Organization/examiner-organization",
      "display": "Organisation"
    }
  ],
  "valueDateTime": "2020-04-24",
  "component": [
    {
      "code": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "161713000"
          }
        ]
      },
      "valueDateTime": "2019-07-14"
    },
    {
      "code": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "161716008"
          }
        ]
      },
      "valueQuantity": {
        "value": 28,
        "unit": "days",
        "system": "http://unitsofmeasure.org",
        "code": "d"
      }
    },
    {
      "code": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "246103008"
          }
        ]
      },
      "valueCodeableConcept": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "64957009",
            "display": "Uncertain"
          }
        ]
      }
    },
    {
      "code": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "246202005"
          }
        ]
      },
      "valueCodeableConcept": {
        "coding": [
          {
            "system": "http://snomed.info/sct",
            "code": "49608001",
            "display": "Irregular"
          }
        ]
      }
    }
  ]
}