An example of a HDL measurement.

{
  "resourceType" : "Observation",
  "id" : "hdl",
  "status" : "final",
  "category" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/observation-category",
      "code" : "laboratory",
      "display" : "Laboratory"
    }],
    "text" : "Laboratory"
  },
  {
    "coding" : [{
      "system" : "urn:oid:1.2.840.114350.1.13.177.2.7.10.798268.30",
      "code" : "Lab",
      "display" : "Lab"
    }],
    "text" : "Lab"
  }],
  "code" : {
    "coding" : [{
      "system" : "http://loinc.org",
      "code" : "2085-9",
      "display" : "Cholesterol in HDL [Mass/volume] in Serum or Plasma"
    }],
    "text" : "HDL"
  },
  "subject" : {
    "reference" : "Patient/pat2"
  },
  "effectiveDateTime" : "2015-08-16T06:40:17Z",
  "issued" : "2015-08-16T08:40:17Z",
  "valueQuantity" : {
    "value" : 46,
    "unit" : "mg/dL",
    "system" : "http://unitsofmeasure.org",
    "code" : "mg/dL"
  },
  "specimen" : {
    "reference" : "Specimen/sst",
    "display" : "Serum sample"
  },
  "referenceRange" : [{
    "low" : {
      "value" : 40,
      "comparator" : ">",
      "unit" : "mg/dL",
      "system" : "http://unitsofmeasure.org",
      "code" : "mg/dL"
    }
  }]
}