FHIR Extensions Pack
5.3.0-ballot-tc1 - (September 2025 Ballot) International flag

FHIR Extensions Pack, published by HL7 International / FHIR Infrastructure. This guide is not an authorized publication; it is the continuous build for version 5.3.0-ballot-tc1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-extensions/ and changes regularly. See the Directory of published versions

Extension: Observation Precondition

Official URL: http://hl7.org/fhir/StructureDefinition/observation-precondition Version: 5.3.0-ballot-tc1
Standards status: Trial-use Maturity Level: 3 Responsible: HL7 International / Orders and Observations Computable Name: ObsPrecondition
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1470

Other preceding or concurrent observations that must be known to understand the context and significance of the observation. For example, an fiO2 measure taken alongside of a SpO2 measurement. See the FHIR specification Observation notes section for additional guidance. Use Observation.intpretationContext after R5.

Context of Use

This extension may be used on the following element(s)

Usage info

Usages:

  • This Extension is not used by any profiles in this Implementation Guide

You can also check for usages in the FHIR IG Statistics

Changes since version 5.2.0:

  • The resource metadata has changed (description)
  • The data elements list has changed
  • One or more text definitions, invariants or bindings have changed

    • Formal Views of Extension Content

    Description of Profiles, Differentials, Snapshots, and how the XML and JSON presentations work.

    This structure is derived from Extension

    Summary

    Simple Extension with the type Reference: Other preceding or concurrent observations that must be known to understand the context and significance of the observation. For example, an fiO2 measure taken alongside of a SpO2 measurement. See the FHIR specification Observation notes section for additional guidance. Use Observation.intpretationContext after R5.

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Other Observations needed to understand the context and significance of the source observation.
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-precondition"
    ... value[x] 1..1 Reference(Observation) Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Other Observations needed to understand the context and significance of the source observation.
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-precondition"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type Reference: Other preceding or concurrent observations that must be known to understand the context and significance of the observation. For example, an fiO2 measure taken alongside of a SpO2 measurement. See the FHIR specification Observation notes section for additional guidance. Use Observation.intpretationContext after R5.

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Other Observations needed to understand the context and significance of the source observation.
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-precondition"
    ... value[x] 1..1 Reference(Observation) Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..* Extension Other Observations needed to understand the context and significance of the source observation.
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-precondition"

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Constraints

    IdGradePath(s)DetailsRequirements
    ele-1error**ALL** elementsAll FHIR elements must have a @value or children
    : hasValue() or (children().count() > id.count())
    ext-1error**ALL** extensionsMust have either extensions or value[x], not both
    : extension.exists() != value.exists()

    R4B

    The extension is not used in R4B

    • Duplicate Resource http://hl7.org/fhir/StructureDefinition/observation-precondition of type StructureDefinition (existing version 4.3.0, new version 5.3.0-ballot-tc1)

    R4

    The extension is not used in R4

    • Duplicate Resource http://hl7.org/fhir/StructureDefinition/observation-precondition of type StructureDefinition (existing version 4.0.1, new version 5.3.0-ballot-tc1)

    R3

    The extension is unchanged in R3

    Search Parameters for this Extension

    (none found)