<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="SmartAL-Observation-SpO2" />
  <url value="http://alticelabs.com/fhir/StructureDefinition/SmartAL-Observation-SpO2" />
  <name value="SmartALObservationSpO2" />
  <title value="SmartAL Observation — Oxygen Saturation (SpO2)" />
  <status value="active" />
  <description value="Oxygen saturation in arterial blood by pulse oximetry (LOINC 59408-5).&#xA;Value in percent.&#xA;&#xA;Interpretation and referenceRange MAY be present when a matching&#xA;ObservationDefinition exists." />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://alticelabs.com/fhir/StructureDefinition/SmartAL-Observation-Base" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.code.coding">
      <path value="Observation.code.coding" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="code" />
        </discriminator>
        <rules value="open" />
      </slicing>
    </element>
    <element id="Observation.code.coding:loinc">
      <path value="Observation.code.coding" />
      <sliceName value="loinc" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Observation.code.coding:loinc.system">
      <path value="Observation.code.coding.system" />
      <fixedUri value="http://loinc.org" />
    </element>
    <element id="Observation.code.coding:loinc.code">
      <path value="Observation.code.coding.code" />
      <min value="1" />
      <fixedCode value="59408-5" />
    </element>
    <element id="Observation.code.coding:loinc.display">
      <path value="Observation.code.coding.display" />
      <fixedString value="Oxygen saturation in Arterial blood by Pulse oximetry" />
    </element>
    <element id="Observation.value[x]">
      <path value="Observation.value[x]" />
      <min value="1" />
      <type>
        <code value="Quantity" />
      </type>
    </element>
    <element id="Observation.value[x].value">
      <path value="Observation.value[x].value" />
      <min value="1" />
    </element>
    <element id="Observation.value[x].unit">
      <path value="Observation.value[x].unit" />
      <fixedString value="%" />
    </element>
    <element id="Observation.value[x].system">
      <path value="Observation.value[x].system" />
      <fixedUri value="http://unitsofmeasure.org" />
    </element>
    <element id="Observation.value[x].code">
      <path value="Observation.value[x].code" />
      <fixedCode value="%" />
    </element>
  </differential>
</StructureDefinition>