UCUM
Unified Code for Units of Measure terminology, healthcare domain.
Definition
UCUM is a formal notation for units, designed for unambiguous machine reading. Covers SI, US Customary, clinical units. Examples: mg/dL, mL/min/{1.73_m2}, mmol/L. Maintained by the Regenstrief Institute.
Origin
Initiated 1998 by Gunther Schadow and Clem McDonald (Regenstrief). Cited as default valueSet for Quantity.unit in FHIR.
Example in context
In FHIR Observation, valueQuantity = {value: 5.5, unit: "mmol/L", system: "http://unitsofmeasure.org", code: "mmol/L"}.