---
type: "valueset"
title: "Observation Relationship Types"
valueset: "observation-relationshiptypes"
---
# Observation Relationship Types

- **Status**: draft
- **Name**: ObservationRelationshipTypes
- **Title**: Observation Relationship Types
- **Publisher**: FHIR Project team
- **Description**: Relationship type between two observations

## Content (Compose)

- **System**: http://terminology.hl7.org/CodeSystem/v3-ActRelationshipType | **Concepts**: COMP, MBR, DRIV, SEQL, RPLC, QUALF, INTF

## ValueSet XML



```xml
<?xml version="1.0" encoding="UTF-8"?>

<ValueSet xmlns="http://hl7.org/fhir">
  <name value="ObservationRelationshipTypes"/>
  <title value="Observation Relationship Types"/>
  <status value="draft"/>
  <experimental value="true"/>
  <publisher value="FHIR Project team"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
  </contact>
  <description value="Relationship type between two observations"/>
  <compose>
    <include>
      <system value="http://terminology.hl7.org/CodeSystem/v3-ActRelationshipType"/>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="The target observation is a component of this observation (e.g. Systolic and Diastolic Blood Pressure)"/>
        </extension>
        <code value="COMP"/>
      </concept>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="The target observation is grouped into a logical group of observations (e.g. a battery, a panel of tests, a set of vital sign measurements)"/>
        </extension>
        <code value="MBR"/>
      </concept>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="The target observation is part of the information from which this observation value is derived (e.g. calculated anion gap, Apgar score)"/>
        </extension>
        <code value="DRIV"/>
      </concept>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="This observation follows the target observation (e.g. timed tests such as Glucose Tolerance Test)"/>
        </extension>
        <code value="SEQL"/>
      </concept>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="This observation replaces a previous observation (i.e. a revised value). The target observation is now obsolete"/>
        </extension>
        <code value="RPLC"/>
      </concept>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="The value of the target observation qualifies (refines) the semantics of the source observation (e.g. a lipaemia measure target from a plasma measure)"/>
        </extension>
        <code value="QUALF"/>
      </concept>
      <concept>
        <extension url="http://hl7.org/fhir/StructureDefinition/tools-extensions#definition">
          <valueString value="The value of the target observation interferes (degardes 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)"/>
        </extension>
        <code value="INTF"/>
      </concept>
    </include>
  </compose>
</ValueSet>
```