<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="pH" />
  <url value="https://www.netzwerk-universitaetsmedizin.de/fhir/StructureDefinition/pH" />
  <version value="1.0.6" />
  <name value="PH" />
  <title value="pH" />
  <status value="active" />
  <experimental value="false" />
  <date value="2021-05-28" />
  <publisher value="Berlin Institute of Health at Charité (BIH)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="https://www.bihealth.org/en/research/core-facilities/interoperability/" />
    </telecom>
  </contact>
  <description value="pH-value of Blood" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="https://www.medizininformatik-initiative.de/fhir/core/modul-labor/StructureDefinition/ObservationLab" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.category.coding:blood-gas-studies">
      <path value="Observation.category.coding" />
      <sliceName value="blood-gas-studies" />
      <min value="0" />
      <max value="1" />
      <patternCoding>
        <system value="http://loinc.org" />
        <code value="18767-4" />
      </patternCoding>
    </element>
    <element id="Observation.code.coding">
      <path value="Observation.code.coding" />
      <slicing>
        <discriminator>
          <type value="pattern" />
          <path value="$this" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Observation.code.coding:pH-blood">
      <path value="Observation.code.coding" />
      <sliceName value="pH-blood" />
      <min value="0" />
      <max value="1" />
      <patternCoding>
        <system value="http://loinc.org" />
        <code value="11558-4" />
      </patternCoding>
    </element>
    <element id="Observation.code.coding:pH-blood.system">
      <path value="Observation.code.coding.system" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding:pH-blood.code">
      <path value="Observation.code.coding.code" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding:pH-arterial">
      <path value="Observation.code.coding" />
      <sliceName value="pH-arterial" />
      <min value="0" />
      <max value="1" />
      <patternCoding>
        <system value="http://loinc.org" />
        <code value="2744-1" />
      </patternCoding>
    </element>
    <element id="Observation.code.coding:pH-arterial.system">
      <path value="Observation.code.coding.system" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding:pH-arterial.code">
      <path value="Observation.code.coding.code" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding:pH-capillary">
      <path value="Observation.code.coding" />
      <sliceName value="pH-capillary" />
      <min value="0" />
      <max value="1" />
      <patternCoding>
        <system value="http://loinc.org" />
        <code value="2745-8" />
      </patternCoding>
    </element>
    <element id="Observation.code.coding:pH-capillary.system">
      <path value="Observation.code.coding.system" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding:pH-capillary.code">
      <path value="Observation.code.coding.code" />
      <min value="1" />
    </element>
    <element id="Observation.subject">
      <path value="Observation.subject" />
      <type>
        <code value="Reference" />
        <profile value="https://www.medizininformatik-initiative.de/fhir/core/StructureDefinition/MII-Reference" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Patient" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Group" />
      </type>
    </element>
    <element id="Observation.value[x]:valueQuantity">
      <path value="Observation.value[x]" />
      <sliceName value="valueQuantity" />
      <type>
        <code value="Quantity" />
      </type>
    </element>
    <element id="Observation.value[x]:valueQuantity.code">
      <path value="Observation.value[x].code" />
      <fixedCode value="[pH]" />
    </element>
    <element id="Observation.value[x]:valueCodeableConcept">
      <path value="Observation.value[x]" />
      <sliceName value="valueCodeableConcept" />
      <max value="0" />
      <type>
        <code value="CodeableConcept" />
      </type>
    </element>
  </differential>
</StructureDefinition>