An example to demonstrate using the bodyPosition and delta extensions (id = "map-sitting")

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

<Observation xmlns="http://hl7.org/fhir">
  <id value="map-sitting"/> 
  <!--    To be used only when the body position in not precoordinated in the observation
   code.  -->
  <extension url="http://hl7.org/fhir/StructureDefinition/observation-bodyPosition">
    <valueCodeableConcept> 
      <coding> 
        <system value="http://snomed.info/sct"/> 
        <code value="33586001"/> 
        <display value="Sitting position (finding)"/> 
      </coding> 
    </valueCodeableConcept> 
  </extension> 
  <!--    The qualitative change in the value relative to the previous measurement. Usually
   only recorded if the change is clinically significant.  -->
  <extension url="http://hl7.org/fhir/StructureDefinition/observation-delta">
    <valueCodeableConcept> 
      <coding> 
        <system value="http://snomed.info/sct"/> 
        <code value="1250004"/> 
        <display value="Decreased (qualifier value)"/> 
      </coding> 
    </valueCodeableConcept> 
  </extension> 
  <status value="final"/> 
  <category> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/observation-category"/> 
      <code value="laboratory"/> 
      <display value="Laboratory"/> 
    </coding> 
  </category> 
  <code> 
    <coding> 
      <system value="http://loinc.org"/> 
      <code value="8478-0"/> 
      <display value="Mean blood pressure"/> 
    </coding> 
  </code> 
  <subject> 
    <reference value="Patient/example"/> 
  </subject> 
  <encounter> 
    <reference value="Encounter/example"/> 
  </encounter> 
  <effectivePeriod> 
    <start value="2018-04-02T10:30:10+01:00"/> 
    <end value="2018-04-05T10:30:10+01:00"/> 
  </effectivePeriod> 
  <issued value="2018-04-03T15:30:10+01:00"/> 
  <valueQuantity> 
    <value value="60"/> 
    <unit value="mm Hg"/> 
    <system value="http://unitsofmeasure.org"/> 
    <code value="mm[Hg]"/> 
  </valueQuantity> 
  <interpretation> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/v2-0078"/> 
      <code value="L"/> 
      <display value="Low"/> 
    </coding> 
    <text value="Below low normal"/> 
  </interpretation> 
</Observation>