{
  "resourceType": "Observation",
  "id": "99b79eef-c71e-4ab7-956d-cbd3ef6fe006",
  "meta": {
    "versionId": "1",
    "lastUpdated": "2021-03-12T11:49:26.584+00:00",
    "source": "#8uq0hCqfmfUT0K6w"
  },
  "status": "final",
  "category": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/observation-category",
          "code": "laboratory",
          "display": "laboratory"
        }
      ]
    }
  ],
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "6875-9",
        "display": "Cancer Ag 15-3 [Units/volume] in Serum or Plasma"
      }
    ],
    "text": "Cancer Ag 15-3 [Units/volume] in Serum or Plasma"
  },
  "subject": {
    "reference": "Patient/09a6b259-d141-4f93-82e7-5e076fb0fbf8"
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  "encounter": {
    "reference": "Encounter/5617e933-e85f-4c93-9d0b-9f71b371bc49"
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  "effectiveDateTime": "1965-09-11T13:38:05+00:00",
  "issued": "1965-09-11T13:38:05.387+00:00",
  "valueQuantity": {
    "value": 0.61902,
    "unit": "[arb'U]/mL",
    "system": "http://unitsofmeasure.org",
    "code": "[arb'U]/mL"
  }
}