Discrepancy between representation of codes for UCUM in FHIR v OMOP

Implementers
1

I’m seeing some differences between what I’m getting in FHIR messages from synthea v. codes in OMOP for UCUM vocabulary. Most of these seem to be around punctuation for lack of a better word (things like _, {, }, [, ], /,. etc.). Examples include (concept_id/FHIR/OMOP):
8876, mmHg, mm[Hg]
44777566, {score}, [score]
9117, mL/min/{1.73_m2}, mL/min/1.73.m2

These codes were specifically found in this resource:
https://syntheticmass.mitre.org/v1/fhir/Patient/6f7acde5-db81-4361-82cf-886893a3280c/$everything

I’m using this version of the OMOP vocabulary:
UCUM
Unified Code for Units of Measure (Regenstrief Institute)
http://aurora.regenstrief.org/~ucum/ucum.html#section-Alphabetic-Index
Version 1.8.2
44819107

2

Yeah, there are lots of those discrepancies. The problem is that the logic for the {} and [] is not always straightforward. {} essentially is non-unit context (e.g. cells), and [] is non-standard units. What do you do in the case of “score” for example? Is this just a generic unit (essentially “1”), or a real unit of something?

We should do a revision at some point. @mik?