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: Reference range extension

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

StructureDefinition that adds a typed reference range (low, high, and range type) 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
- 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 | C | 0..* | Extension | Typed reference range Constraints: pocd-rr-1
Slices for extension |  | 1..* | Extension | Extension Slice: Unordered, Open by value:url
extension:low |  | 0..1 | Extension | Low limit
url |  | 1..1 | uri | "low"
valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:high |  | 0..1 | Extension | High limit
url |  | 1..1 | uri | "high"
valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:type |  | 1..1 | Extension | Range type
url |  | 1..1 | uri | "type"
valueCodeableConcept |  | 1..1 | CodeableConcept | Value of extension Binding: Reference Range Type (extensible): Type of reference range applied to a DeviceMetric.
url |  | 1..1 | uri | "http://hl7.org/fhir/StructureDefinition/reference-range"
value[x] |  | 0..0 |  | Value of extension
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension | C | 0..* | Extension | Typed reference range Constraints: pocd-rr-1
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 1..* | Extension | Extension Slice: Unordered, Open by value:url
extension:low |  | 0..1 | Extension | Low 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 | "low"
Slices for value[x] |  | 1..1 | Quantity | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:high |  | 0..1 | Extension | High limit
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "high"
Slices for value[x] |  | 1..1 | Quantity | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:type |  | 1..1 | Extension | Range type
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 | "type"
Slices for value[x] |  | 1..1 | CodeableConcept | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueCodeableConcept |  | 1..1 | CodeableConcept | Value of extension Binding: Reference Range Type (extensible): Type of reference range applied to a DeviceMetric.
url |  | 1..1 | uri | "http://hl7.org/fhir/StructureDefinition/reference-range"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: StructureDefinition that adds a typed reference range (low, high, and range type) to a DeviceMetric.

- low: Quantity: The lower bound of the reference range.
- high: Quantity: The upper bound of the reference range.
- type: CodeableConcept: Classifies the reference range as alarm limits, physiological range, or technical range.

Maturity: 2

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension | C | 0..* | Extension | Typed reference range Constraints: pocd-rr-1
Slices for extension |  | 1..* | Extension | Extension Slice: Unordered, Open by value:url
extension:low |  | 0..1 | Extension | Low limit
url |  | 1..1 | uri | "low"
valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:high |  | 0..1 | Extension | High limit
url |  | 1..1 | uri | "high"
valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:type |  | 1..1 | Extension | Range type
url |  | 1..1 | uri | "type"
valueCodeableConcept |  | 1..1 | CodeableConcept | Value of extension Binding: Reference Range Type (extensible): Type of reference range applied to a DeviceMetric.
url |  | 1..1 | uri | "http://hl7.org/fhir/StructureDefinition/reference-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 | C | 0..* | Extension | Typed reference range Constraints: pocd-rr-1
id |  | 0..1 | string | Unique id for inter-element referencing
Slices for extension |  | 1..* | Extension | Extension Slice: Unordered, Open by value:url
extension:low |  | 0..1 | Extension | Low 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 | "low"
Slices for value[x] |  | 1..1 | Quantity | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:high |  | 0..1 | Extension | High limit
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..* | Extension | Additional content defined by implementations Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "high"
Slices for value[x] |  | 1..1 | Quantity | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueQuantity |  | 1..1 | SimpleQuantity | Value of extension
extension:type |  | 1..1 | Extension | Range type
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 | "type"
Slices for value[x] |  | 1..1 | CodeableConcept | Value of extension Slice: Unordered, Closed by type:$this
value[x]:valueCodeableConcept |  | 1..1 | CodeableConcept | Value of extension Binding: Reference Range Type (extensible): Type of reference range applied to a DeviceMetric.
url |  | 1..1 | uri | "http://hl7.org/fhir/StructureDefinition/reference-range"
Documentation for this format

This structure is derived from Extension

Summary

Complex Extension: StructureDefinition that adds a typed reference range (low, high, and range type) to a DeviceMetric.

- low: Quantity: The lower bound of the reference range.
- high: Quantity: The upper bound of the reference range.
- type: CodeableConcept: Classifies the reference range as alarm limits, physiological range, or technical range.

Maturity: 2

Other representations of profile: CSV, Excel, Schematron

#### Terminology Bindings

Path | Status | Usage | ValueSet | Version | Source
Extension.extension:type.​value[x]:valueCodeableConcept | Base | extensible | Reference Range Type | 📦1.0.0 | This IG

#### 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()`
pocd-rr-1 | error | Extension | At least one of low or high limit shall be present | `extension('low').exists() or extension('high').exists()`