An example of a LDL measurement. (id = "ldl")

<?xml version="1.0" encoding="UTF-8"?>

<Observation xmlns="http://hl7.org/fhir">
  <id value="ldl"/> 
  <status value="final"/> 
  <category> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/observation-category"/> 
      <code value="laboratory"/> 
      <display value="Laboratory"/> 
    </coding> 
    <text value="Laboratory"/> 
  </category> 
  <category> 
    <coding> 
      <system value="urn:oid:1.2.840.114350.1.13.177.2.7.10.798268.30"/> 
      <code value="Lab"/> 
      <display value="Lab"/> 
    </coding> 
    <text value="Lab"/> 
  </category> 
  <code> 
    <coding> 
      <system value="http://loinc.org"/> 
      <code value="2089-1"/> 
      <display value="Cholesterol in LDL [Mass/volume] in Serum or Plasma"/> 
    </coding> 
    <text value="LDL"/> 
  </code> 
  <subject> 
    <reference value="Patient/pat2"/> 
  </subject> 
  <effectiveDateTime value="2015-08-16T06:40:17Z"/> 
  <issued value="2015-08-16T08:40:17Z"/> 
  <valueQuantity> 
    <value value="161"/> 
    <unit value="mg/dL"/> 
    <system value="http://unitsofmeasure.org"/> 
    <code value="mg/dL"/> 
  </valueQuantity> 
  <interpretation> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/v3-ObservationInterpretation"/> 
      <code value="H"/> 
      <display value="High"/> 
    </coding> 
    <text value="High"/> 
  </interpretation> 
  <specimen> 
    <reference value="Specimen/sst"/> 
    <display value="Serum sample"/> 
  </specimen> 
  <referenceRange> 
    <high> 
      <value value="100"/> 
      <comparator value="&lt;"/> 
      <unit value="mg/dL"/> 
      <system value="http://unitsofmeasure.org"/> 
      <code value="mg/dL"/> 
    </high> 
  </referenceRange> 
</Observation>