<Observation xmlns="http://hl7.org/fhir">
  <id value="s4h-24h-average-heart-rate-example" />
  <meta>
    <profile value="http://fhir.smart4health.eu/StructureDefinition/s4h-observation-base" />
  </meta>
  <status value="final" />
  <category>
    <coding>
      <system value="http://terminology.hl7.org/CodeSystem/observation-category" />
      <code value="activity" />
    </coding>
    <text value="Activity" />
  </category>
  <code>
    <coding>
      <system value="http://loinc.org" />
      <code value="41924-2" />
      <display value="Heart rate 24 hour mean" />
    </coding>
    <text value="Heart rate 24 hour mean" />
  </code>
  <subject>
    <identifier>
      <system value="http://fhir.data4life.care/CodeSystem/user-id" />
      <value value="c7382336-e704-4c6b-a4e9-190a3695aa23" />
    </identifier>
  </subject>
  <effectiveDateTime value="2021-05-27" />
  <valueQuantity>
    <value value="70" />
    <unit value="beats per minute" />
    <system value="http://unitsofmeasure.org" />
    <code value="{beats}/min" />
  </valueQuantity>
  <device>
    <identifier>
      <system value="http://example.com/custom-device-id-namespace" />
      <value value="g639d0821535fd6553fa8764" />
    </identifier>
  </device>
</Observation>