HL7 BE Laboratory WG Implementation Guide
1.0.1 - STU

HL7 BE Laboratory WG Implementation Guide, published by eHealth Platform. This guide is not an authorized publication; it is the continuous build for version 1.0.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/hl7-be/lab/ and changes regularly. See the Directory of published versions

## Extension: Comment extension for ReferenceRange

Official URL: https://www.ehealth.fgov.be/standards/fhir/lab/StructureDefinition/be-ext-referencerange-comment | Version: 1.0.1
Draft as of 2026-03-25 | Computable Name: BeReferenceRangeComment

Extension that adds a comment to Observation.ReferenceRange

Context of Use

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

- Element ID: `Observation.referenceRange`

Usage info

Usages:

- Use this Extension: BeObservationLaboratory

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 | Comment extension for ReferenceRange
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "https://www.ehealth.fgov.be/standards/fhir/lab/StructureDefinition/be-ext-referencerange-comment"
value[x] |  | 0..1 | BeCodedAnnotation | Value of extension
Documentation for this format

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Comment extension for ReferenceRange
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "https://www.ehealth.fgov.be/standards/fhir/lab/StructureDefinition/be-ext-referencerange-comment"
value[x] |  | 0..1 | BeCodedAnnotation | Value of extension
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type Annotation: Extension that adds a comment to Observation.ReferenceRange

Differential View

This structure is derived from Extension

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Comment extension for ReferenceRange
extension |  | 0..0 |  | Extension
url |  | 1..1 | uri | "https://www.ehealth.fgov.be/standards/fhir/lab/StructureDefinition/be-ext-referencerange-comment"
value[x] |  | 0..1 | BeCodedAnnotation | Value of extension
Documentation for this format

Snapshot View

Name | Flags | Card. | Type | Description & Constraints Filter: Bindings Constraints Obligations
--- | --- | --- | --- | ---
Extension |  | 0..* | Extension | Comment extension for ReferenceRange
id |  | 0..1 | string | Unique id for inter-element referencing
extension |  | 0..0 |  | Extension Slice: Unordered, Open by value:url
url |  | 1..1 | uri | "https://www.ehealth.fgov.be/standards/fhir/lab/StructureDefinition/be-ext-referencerange-comment"
value[x] |  | 0..1 | BeCodedAnnotation | Value of extension
Documentation for this format

This structure is derived from Extension

Summary

Simple Extension with the type Annotation: Extension that adds a comment to Observation.ReferenceRange

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()`