{
  "resourceType" : "Observation",
  "id" : "example-fev1-single-measurement",
  "meta" : {
    "profile" : ["https://gematik.de/fhir/hddt/StructureDefinition/hddt-lung-function-testing"]
  },
  "status" : "final",
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "20150-9",
      "display" : "FEV1"
    }]
  },
  "effectiveDateTime" : "2025-12-28T08:00:00Z",
  "valueQuantity" : {
    "value" : 3.4,
    "unit" : "L",
    "system" : "http://unitsofmeasure.org",
    "code" : "L"
  },
  "device" : {
    "reference" : "Device/example-device-peak-flow-meter"
  }
}