Measurement Rationale Extension¶
| Canonical | ../StructureDefinition/measurement-rationale |
|---|---|
| Status | draft · 1.26.0 |
| Base | Extension (constraint) |
| Context | ObservationDefinition (element) |
| Source | FSH · JSON |
Why this measurement definition exists: the specific ambiguity or unit trap it prevents. Required on every definition, because a definition that cannot name the failure it prevents is a guess, and the failures this guards against (affine unit conversions, off-by-one ordinal scales) produce numbers that render and validate while being wrong. Carried as an extension because R4's ObservationDefinition has no narrative element; it retires into description on a move to R5.
Salient fields
No salient fields have been declared for this profile yet — nothing states which few values represent a Extension in charts, summaries, and LLM contexts. See Salient Fields for what they are, how they shape LLM contexts, and how to declare them.