<Observation xmlns="http://hl7.org/fhir">
  <id value="BodyMassIndexObservation Instance Example" />
  <meta>
    <profile value="http://hl7.org/fhir/us/bser/StructureDefinition/BodyMassIndexObservation" />
  </meta>
  <status value="final" />
  <category>
    <coding>
      <system value="http://hl7.org/fhir/observation-category" />
      <code value="vital-signs" />
      <display value="Vital Signs" />
    </coding>
  </category>
  <code>
    <coding>
      <system value="http://loinc.org" />
      <code value="39156-5" />
      <display value="Body mass index (BMI) [Ratio]" />
    </coding>
  </code>
  <effectiveDateTime value="2018-09-29" />
  <valueQuantity>
    <value value="16.2" />
    <unit value="kg/m2" />
    <system value="http://unitsofmeasure.org" />
    <code value="kg/m2" />
  </valueQuantity>
</Observation>