{
  "resourceType" : "Observation",
  "id" : "example-fev1-reference-value",
  "meta" : {
    "profile" : ["https://gematik.de/fhir/hddt/StructureDefinition/hddt-lung-reference-value"]
  },
  "status" : "final",
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "20149-1",
      "display" : "FEV1 predicted"
    }]
  },
  "effectivePeriod" : {
    "start" : "2025-05-01"
  },
  "valueQuantity" : {
    "value" : 4.5,
    "unit" : "L",
    "system" : "http://unitsofmeasure.org",
    "code" : "L"
  },
  "method" : {
    "coding" : [{
      "system" : "https://gematik.de/fhir/hddt/CodeSystem/hddt-lung-function-reference-value-method-codes",
      "code" : "GLI-2022"
    }]
  },
  "device" : {
    "reference" : "Device/example-device-peak-flow-meter"
  }
}