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Source1

{
  "resourceType": "Observation",
  "id": "Pathology-Observation-eGFR-Example",
  "meta": {
    "profile": [
      "https://fhir.hl7.org.uk/StructureDefinition/UKCore-Observation-Lab"
    ]
  },
  "identifier": [
    {
      "system": "https://tools.ietf.org/html/rfc4122",
      "value": "e6127f03-4a96-45d3-abd8-1adcf0189be4"
    }
  ],
  "status": "final",
  "category": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/observation-category",
          "code": "laboratory",
          "display": "Laboratory"
        }
      ]
    }
  ],
  "code": {
    "coding": [
      {
        "system": "http://snomed.info/sct",
        "code": "1011481000000105",
        "display": "eGFR (estimated glomerular filtration rate) using creatinine Chronic Kidney Disease Epidemiology Collaboration equation per 1.73 square metres"
      }
    ]
  },
  "subject": {
    "reference": "urn:uuid:ab87a3f8-1d37-44a9-804e-5e962598a6e4",
    "display": "WELSH, Joel"
  },
  "issued": "2022-03-08T14:23:00+00:00",
  "performer": [
    {
      "reference": "urn:uuid:8a6d85b8-9837-4fed-a257-4cf207988338",
      "display": "TD008362 PATH LAB 001"
    }
  ],
  "valueQuantity": {
    "value": 90,
    "comparator": ">",
    "unit": "mL/min/1.73m2",
    "system": "http://unitsofmeasure.org",
    "code": "mL/min/((173/100).m2)"
  },
  "note": [
    {
      "text": "Calculated eGFR is not valid in children or pregnancy.\\nLess accurate with acute change in creatinine (AKI).\\nCaution with high or low muscle mass or amputation.\\nAvoid blood sampling within 12 hours of eating meat.\\nEthnicity factor comment removed Dec21 NG203."
    }
  ],
  "specimen": {
    "reference": "urn:uuid:bab0eaec-1ec5-4598-b660-90bb38a1030d"
  }
}