Point-of-Care Device Implementation Guide
1.0.0 - STU 1

Point-of-Care Device Implementation Guide, published by HL7 International / Devices. This guide is not an authorized publication; it is the continuous build for version 1.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/uv-pocd/ and changes regularly. See the Directory of published versions

## Extension: Technical range extension

Official URL: http://hl7.org/fhir/uv/pocd/StructureDefinition/technical-range | Version: 1.0.0
Standards status: Trial-use | Maturity Level: 2 | Computable Name: TechnicalRange

StructureDefinition that adds technical range and accuracy to a DeviceMetric.

Context of Use

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

- Element ID: `DeviceMetric`

Usage info

Usages:

- Use this Extension: Numeric DeviceMetric profile and Sample Array DeviceMetric profile
- Examples for this Extension: DeviceMetric/HeartRateNumericDeviceMetric

You can also check for usages in the FHIR IG Statistics

### Formal Views of Extension Content

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

- Differential Table
- Snapshot Table
- Statistics/References
- All

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Technical range and accuracy
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:lowerLimit |  | 0..1 | Extension | Lower limit
url |  | 1..1 | uri | "lowerLimit"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:upperLimit |  | 0..1 | Extension | Upper limit
url |  | 1..1 | uri | "upperLimit"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:stepWidth |  | 0..1 | Extension | Step width
url |  | 1..1 | uri | "stepWidth"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:relativeAccuracy |  | 0..1 | Extension | Relative error
url |  | 1..1 | uri | "relativeAccuracy"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:absoluteAccuracy |  | 0..1 | Extension | Absolute error
url |  | 1..1 | uri | "absoluteAccuracy"
valueDecimal |  | 1..1 | decimal | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/technical-range"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Technical range and accuracy
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:lowerLimit |  | 0..1 | Extension | Lower limit
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "lowerLimit"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:upperLimit |  | 0..1 | Extension | Upper limit
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "upperLimit"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:stepWidth |  | 0..1 | Extension | Step width
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "stepWidth"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:relativeAccuracy |  | 0..1 | Extension | Relative error
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "relativeAccuracy"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:absoluteAccuracy |  | 0..1 | Extension | Absolute error
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "absoluteAccuracy"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/technical-range"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: StructureDefinition that adds technical range and accuracy to a DeviceMetric.

- lowerLimit: decimal: Lower limit of detection.
- upperLimit: decimal: Upper limit of detection.
- stepWidth: decimal: The numerical distance between two values in the range of the given upper and lower bound.
- relativeAccuracy: decimal: An Extension
- absoluteAccuracy: decimal: Maximum absolute error in relation to the correct value within the given range.

Maturity: 2

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Technical range and accuracy
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:lowerLimit |  | 0..1 | Extension | Lower limit
url |  | 1..1 | uri | "lowerLimit"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:upperLimit |  | 0..1 | Extension | Upper limit
url |  | 1..1 | uri | "upperLimit"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:stepWidth |  | 0..1 | Extension | Step width
url |  | 1..1 | uri | "stepWidth"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:relativeAccuracy |  | 0..1 | Extension | Relative error
url |  | 1..1 | uri | "relativeAccuracy"
valueDecimal |  | 1..1 | decimal | Value of extension
extension:absoluteAccuracy |  | 0..1 | Extension | Absolute error
url |  | 1..1 | uri | "absoluteAccuracy"
valueDecimal |  | 1..1 | decimal | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/technical-range"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Technical range and accuracy
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 0..* | Extension | Extension Slice: Unordered, Open by value:url
extension:lowerLimit |  | 0..1 | Extension | Lower limit
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "lowerLimit"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:upperLimit |  | 0..1 | Extension | Upper limit
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "upperLimit"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:stepWidth |  | 0..1 | Extension | Step width
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "stepWidth"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:relativeAccuracy |  | 0..1 | Extension | Relative error
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "relativeAccuracy"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
extension:absoluteAccuracy |  | 0..1 | Extension | Absolute error
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "absoluteAccuracy"
Slices for value[x] |  | 1..1 | decimal | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueDecimal |  | 1..1 | decimal | Value of extension
url |  | 1..1 | uri | "http://hl7.org/fhir/uv/pocd/StructureDefinition/technical-range"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: StructureDefinition that adds technical range and accuracy to a DeviceMetric.

- lowerLimit: decimal: Lower limit of detection.
- upperLimit: decimal: Upper limit of detection.
- stepWidth: decimal: The numerical distance between two values in the range of the given upper and lower bound.
- relativeAccuracy: decimal: An Extension
- absoluteAccuracy: decimal: Maximum absolute error in relation to the correct value within the given range.

Maturity: 2

Other representations of profile: CSV, Excel, Schematron

#### Constraints

Id | Grade | Path(s) | Description | Expression
ele-1 | error | **ALL** elements | All FHIR elements must have a @value or children | `hasValue() or (children().count() > id.count())`
ext-1 | error | **ALL** extensions | Must have either extensions or value[x], not both | `extension.exists() != value.exists()`