<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="observation-relationshiptypes" />
  <text>
    <status value="generated" />
    <div xmlns="http://www.w3.org/1999/xhtml">
      <p>The narrative has been removed to reduce the size of the distribution of the Hl7.Fhir.Specification library</p>
    </div>
  </text>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-ballot-status">
    <valueString value="Informative" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="5" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="oo" />
  </extension>
  <url value="http://hl7.org/fhir/observation-relationshiptypes" />
  <identifier>
    <system value="urn:ietf:rfc:3986" />
    <value value="urn:oid:2.16.840.1.113883.4.642.1.390" />
  </identifier>
  <version value="3.0.0" />
  <name value="ObservationRelationshipType" />
  <status value="draft" />
  <experimental value="false" />
  <date value="2017-04-03T11:27:53+00:00" />
  <publisher value="HL7 (FHIR Project)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://hl7.org/fhir" />
    </telecom>
    <telecom>
      <system value="email" />
      <value value="fhir@lists.hl7.org" />
    </telecom>
  </contact>
  <description value="Codes specifying how two observations are related." />
  <caseSensitive value="true" />
  <valueSet value="http://hl7.org/fhir/ValueSet/observation-relationshiptypes" />
  <content value="complete" />
  <concept>
    <code value="has-member" />
    <display value="Has Member" />
    <definition value="This observation is a group observation (e.g. a battery, a panel of tests, a set of vital sign measurements) that includes the target as a member of the group." />
  </concept>
  <concept>
    <code value="derived-from" />
    <display value="Derived From" />
    <definition value="The target resource (Observation or QuestionnaireResponse) is part of the information from which this observation value is derived. (e.g. calculated anion gap, Apgar score)  NOTE:  &quot;derived-from&quot; is the only logical choice when referencing QuestionnaireResponse." />
  </concept>
  <concept>
    <code value="sequel-to" />
    <display value="Sequel To" />
    <definition value="This observation follows the target observation (e.g. timed tests such as Glucose Tolerance Test)." />
  </concept>
  <concept>
    <code value="replaces" />
    <display value="Replaces" />
    <definition value="This observation replaces a previous observation (i.e. a revised value). The target observation is now obsolete." />
  </concept>
  <concept>
    <code value="qualified-by" />
    <display value="Qualified By" />
    <definition value="The value of the target observation qualifies (refines) the semantics of the source observation (e.g. a lipemia measure target from a plasma measure)." />
  </concept>
  <concept>
    <code value="interfered-by" />
    <display value="Interfered By" />
    <definition value="The value of the target observation interferes (degrades quality, or prevents valid observation) with the semantics of the source observation (e.g. a hemolysis measure target from a plasma potassium measure, which has no value)." />
  </concept>
</CodeSystem>