Add unit_system and unit_display_name attributes to DV_QUANTITY


Add fields to DV_QUANTITY for units system and units display name: String.

Values for unit_system field: a URI, see FHIR (

Guidance: these are optional fields; either or both may be set. Unit_label value is for direct display.

If unit system is void, assume UCUM (i.e. that the value is '')

If unit_label is not filled in, the application system has to convert units to the displayable form itself.


Thomas Beale

Raised By

Heath Frankel
Ian McNicoll


Affects versions