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

This page is part of the FHIR Core Extensions Registry (v5.3.0-ballot-tc1: Release 5.3) based on FHIR (HL7® FHIR® Standard) v5.0.0. This version is a pre-release. The current official version is 5.2.0. For a full list of available versions, see the Directory of published versions

Extension: Observation Delta

Official URL: http://hl7.org/fhir/StructureDefinition/observation-delta Version: 5.3.0-ballot-tc1
Standards status: Deprecated Maturity Level: 3 Responsible: HL7 International / Orders and Observations Computable Name: ObsDelta
Other Identifiers: OID:2.16.840.1.113883.4.642.5.1477

The qualitative change in the value relative to the previous measurement. Usually only recorded if the change is clinically significant. Note: To perform a delta check one can instantiate a new observation (the comparison observation) with derivedFrom populated with references to the two prior Observations that triggered the delta check. Also, the Observation.interpretation of the comparison Observation has the code of the interpretation of the delta check.

Context of Use

This extension is deprecated and should no longer be used

Shall be handled using a different mechanism. See Observation Notes for more information.

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

Usage info

Usages:

You can also check for usages in the FHIR IG Statistics

Changes since version 5.2.0:

  • The resource metadata has changed (status, description)

    • 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 CodeableConcept: The qualitative change in the value relative to the previous measurement. Usually only recorded if the change is clinically significant. Note: To perform a delta check one can instantiate a new observation (the comparison observation) with derivedFrom populated with references to the two prior Observations that triggered the delta check. Also, the Observation.interpretation of the comparison Observation has the code of the interpretation of the delta check.

    Maturity: 3

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Qualitative change or trend in the measurement
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-delta"
    ... value[x] 1..1 CodeableConcept Value of extension

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Qualitative change or trend in the measurement
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-delta"

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type CodeableConcept: The qualitative change in the value relative to the previous measurement. Usually only recorded if the change is clinically significant. Note: To perform a delta check one can instantiate a new observation (the comparison observation) with derivedFrom populated with references to the two prior Observations that triggered the delta check. Also, the Observation.interpretation of the comparison Observation has the code of the interpretation of the delta check.

    Maturity: 3

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Qualitative change or trend in the measurement
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-delta"
    ... value[x] 1..1 CodeableConcept Value of extension

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Qualitative change or trend in the measurement
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/observation-delta"

    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 unchanged in R4B

    R4

    The extension is unchanged in R4

    R3

    The extension is unchanged in R3

    Search Parameters for this Extension

    (none found)