{
  "resourceType" : "Observation",
  "id" : "head-circumference",
  "meta" : {
    "profile" : ["http://hl7.org/fhir/StructureDefinition/vitalsigns"]
  },
  "status" : "final",
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "vital-signs",
      "display" : "Vital Signs"
    }],
    "text" : "Vital Signs"
  }],
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "9843-4",
      "display" : "Head Occipital-frontal circumference"
    }],
    "text" : "Head Circumference"
  },
  "subject" : {
    "reference" : "Patient/example"
  },
  "effectiveDateTime" : "1999-07-02",
  "valueQuantity" : {
    "value" : 51.2,
    "unit" : "cm",
    "system" : "http://unitsofmeasure.org",
    "code" : "cm"
  }
}