|HL7Connect: UCUM Support|
UCUM (Unified Code for Units of Measure) is defined by Regenstrief to allow a systematic computable approach to scientific units. In CDA, units of measurements must use UCUM, and UCUM can be used in HL7 v2. UCUM defines a systematic syntax for representing all units, and aslo defines codes for all known systematic units, such that most units can be represented in a human readable fashion that is non ambiguous. Note that common human systematic usage of codes (in scientific papers, text books etc) is ambiguous because some (non-SI) unit codes are reused in multiple contexts. The problem is that many non-SI codes are in common use in medical practice. UCUM is maintained at UnitsOfMeasure.org
HL7Connect includes a copy of UCUM, and uses that copy to provide the following UCUM services:
If mmore recent versions of UCUM have been released that contain units not known by HL7Connect, you can update the UCUM cache.