HL7 FHIR Implementation Guide: minimal Common Oncology Data Elements (mCODE) Release 1 - US Realm | STU Ballot 1

HL7 FHIR Implementation Guide: minimal Common Oncology Data Elements (mCODE) Release 1 - US Realm | STU Ballot 1 - Local Development build (v0.9.1). See the Directory of published versions


Definitions for onco-core-VariantDescription-extension.

1. Extension

A clinician-friendly description for the variant. This could be, but not limited to, the protein change associated with the variation. For example, the protein change associated with Clinvar 3236 is G482V.

Control0..* This element is affected by the following invariants: ele-1
InvariantsDefined on this element
ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))
ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())
2. Extension.id

Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.

3. Extension.extension

May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.

Alternate Namesextensions, user content

There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions. The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.

4. Extension.url

Source of the definition for the extension code - a logical name or a URL.


The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.

Fixed Valuehttp://hl7.org/fhir/us/mcode/StructureDefinition/onco-core-VariantDescription-extension
5. Extension.valueString

Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).