{
  "resourceType": "Observation",
  "id": "observation-21",
  "identifier": [
    {
      "use": "official",
      "system": "http://example.laboratory.com",
      "value": "1021"
    }
  ],
  "basedOn": [
    {
      "reference": "ServiceRequest/servicerequest_unk"
    }
  ],
  "status": "final",
  "category": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/observation-category",
          "code": "laboratory",
          "display": "Laboratory"
        }
      ],
      "text": "Laboratory"
    },
    {
      "coding": [
        {
          "system": "urn:oid:1.2.345.6789",
          "code": "Lab",
          "display": "Lab"
        }
      ],
      "text": "Laboratory"
    }
  ],
  "code": {
    "coding": [
      {
        "system": "http://loinc.org",
        "code": "718-7",
        "display": "Hemoglobin [Mass/volume] in Blood"
      },
      {
        "system": "urn:oid:1.2.345.6789",
        "code": "10021",
        "display": "Hemoglobin (Hb)"
      }
    ],
    "text": "Hemoglobin (Hb)"
  },
  "subject": {
    "reference": "Patient/patient-1",
    "display": "Example, Anne"
  },
  "encounter": {
    "reference": "Encounter/encounter-1",
    "identifier": {
      "use": "usual",
      "system": "urn:oid:1.2.345.6789",
      "value": "10001"
    },
    "display": "Emergency admission"
  },
  "performer": [
    {
      "display": "On-call doctor"
    }
  ],
  "effectiveDateTime": "2023-11-04T18:40:00Z",
  "issued": "2023-11-04T20:12:49Z",
  "valueQuantity": {
    "value": 12.1,
    "unit": "g/dL",
    "system": "http://unitsofmeasure.org",
    "code": "g/dL"
  },
  "referenceRange": [
    {
      "low": {
        "value": 12.0,
        "unit": "g/dL",
        "system": "http://unitsofmeasure.org",
        "code": "g/dL"
      },
      "high": {
        "value": 16.0,
        "unit": "g/dL",
        "system": "http://unitsofmeasure.org",
        "code": "g/dL"
      }
    }
  ],
  "interpretation": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation",
          "code": "N",
          "display": "Normal"
        }
      ]
    }
  ],
  "specimen": {
    "reference": "Specimen/specimen_unk",
    "display": "Specimen"
  }
}