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: Quantity Accuracy (Experimental)

Official URL: http://hl7.org/fhir/StructureDefinition/quantity-accuracy Version: 5.3.0-ballot-tc1
Standards status: Draft Maturity Level: 0 Responsible: HL7 International / Orders and Observations Computable Name: QuantityAccuracy

The absolute of the maximum deviation of the actual value from the reported value.

Accuracy is particularly applicable to measured or observed values, and represents the maximum deviation over the entire range of measurement. When applied to a DeviceMetric, it expresses the maximum deviation of values reported by the metric. The reported observed value should be precise enough to reflect this accuracy, for example an observed value of 3.2 kg with an accuracy of 0.04 kg would be nonsensical. On the other hand, an observed value of 3.02 kg with an accuracy of 0.04 kg would indicate that the actual value is in the range of 3.02±0.04 kg or [2.98, 3.06] kg.

Accuracy is usually in the same units as the reported value. Accuracy valueQuantity units SHOULD be provided for clarity; if omitted, they are implied to be the same as the reported value's units (or the DeviceMetric units).

This is an experimental extension definition; the definition is intended for testing purposes, education or evaluation, and the definition is not anticipated to be matured to a point where it is intended for genuine usage.

Context of Use

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

In addition, the extension can only be used when this FHIRPath expression is true:

$this is Quantity

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:

  • New Content

    • 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 Quantity: The absolute of the maximum deviation of the actual value from the reported value.

    Accuracy is particularly applicable to measured or observed values, and represents the maximum deviation over the entire range of measurement. When applied to a DeviceMetric, it expresses the maximum deviation of values reported by the metric. The reported observed value should be precise enough to reflect this accuracy, for example an observed value of 3.2 kg with an accuracy of 0.04 kg would be nonsensical. On the other hand, an observed value of 3.02 kg with an accuracy of 0.04 kg would indicate that the actual value is in the range of 3.02±0.04 kg or [2.98, 3.06] kg.

    Accuracy is usually in the same units as the reported value. Accuracy valueQuantity units SHOULD be provided for clarity; if omitted, they are implied to be the same as the reported value's units (or the DeviceMetric units).

    Maturity: 0

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Absolute maximum deviation from actual value
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/quantity-accuracy"
    ... value[x] 0..1 Quantity Absolute maximum deviation of the reported value from the actual value
    .... value 1..1 decimal Numerical value (with implicit precision)

    doco Documentation for this format
    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Absolute maximum deviation from actual value
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/quantity-accuracy"
    .... id 0..1 id Unique id for inter-element referencing
    .... extension 0..* Extension Additional content defined by implementations
    Slice: Unordered, Open by value:url
    .... value Σ 1..1 decimal Numerical value (with implicit precision)
    .... comparator ?!Σ 0..1 code < | <= | >= | > | ad - how to understand the value
    Binding: QuantityComparator (required): How the Quantity should be understood and represented.
    .... unit Σ 0..1 string Unit representation
    .... system ΣC 0..1 uri System that defines coded unit form
    .... code ΣC 0..1 code Coded form of the unit

    doco Documentation for this format

    This structure is derived from Extension

    Summary

    Simple Extension with the type Quantity: The absolute of the maximum deviation of the actual value from the reported value.

    Accuracy is particularly applicable to measured or observed values, and represents the maximum deviation over the entire range of measurement. When applied to a DeviceMetric, it expresses the maximum deviation of values reported by the metric. The reported observed value should be precise enough to reflect this accuracy, for example an observed value of 3.2 kg with an accuracy of 0.04 kg would be nonsensical. On the other hand, an observed value of 3.02 kg with an accuracy of 0.04 kg would indicate that the actual value is in the range of 3.02±0.04 kg or [2.98, 3.06] kg.

    Accuracy is usually in the same units as the reported value. Accuracy valueQuantity units SHOULD be provided for clarity; if omitted, they are implied to be the same as the reported value's units (or the DeviceMetric units).

    Maturity: 0

    Differential View

    This structure is derived from Extension

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Absolute maximum deviation from actual value
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/quantity-accuracy"
    ... value[x] 0..1 Quantity Absolute maximum deviation of the reported value from the actual value
    .... value 1..1 decimal Numerical value (with implicit precision)

    doco Documentation for this format

    Snapshot View

    NameFlagsCard.TypeDescription & Constraints    Filter: Filtersdoco
    .. Extension 0..1 Extension Absolute maximum deviation from actual value
    ... id 0..1 id Unique id for inter-element referencing
    ... extension 0..0
    ... url 1..1 uri "http://hl7.org/fhir/StructureDefinition/quantity-accuracy"
    .... id 0..1 id Unique id for inter-element referencing
    .... extension 0..* Extension Additional content defined by implementations
    Slice: Unordered, Open by value:url
    .... value Σ 1..1 decimal Numerical value (with implicit precision)
    .... comparator ?!Σ 0..1 code < | <= | >= | > | ad - how to understand the value
    Binding: QuantityComparator (required): How the Quantity should be understood and represented.
    .... unit Σ 0..1 string Unit representation
    .... system ΣC 0..1 uri System that defines coded unit form
    .... code ΣC 0..1 code Coded form of the unit

    doco Documentation for this format

     

    Other representations of profile: CSV, Excel, Schematron

    Terminology Bindings

    PathConformanceValueSetURI
    Extension.value[x].comparatorrequiredQuantityComparator
    http://hl7.org/fhir/ValueSet/quantity-comparator|5.0.0
    From the FHIR Standard

    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)