An example of a blood Rh antigen measurement. (id = "rhstatus")

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

<Observation xmlns="http://hl7.org/fhir">
  <id value="rhstatus"/> 
  <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> 
  <code> 
    <coding> 
      <system value="http://loinc.org"/> 
      <code value="88027-8"/> 
      <display value="Rh group Ag [Type] on Red Blood Cells"/> 
    </coding> 
    <text value="Rh Type"/> 
  </code> 
  <subject> 
    <reference value="Patient/infant"/> 
  </subject> 
  <effectiveDateTime value="2018-03-11T16:07:54+00:00"/> 
  <valueCodeableConcept> 
    <coding> 
      <system value="http://snomed.info/sct"/> 
      <code value="165747007"/> 
      <display value="Rh positive"/> 
    </coding> 
    <text value="Rh(D) positive (finding)"/> 
  </valueCodeableConcept> 
</Observation>