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CDMFORUM / CDM-GUIDANCE

The PCORnet Common Data Model (CDM) Forum guidance repository contains materials intended to support implementation efforts by data partners, including suggestions, recommendations, and best practices.
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Mapping medication units #61

Open kmarsolo opened 6 years ago

kmarsolo commented 6 years ago

Question: We have unit values in our medication administrations that are not part of the value set listed in the Value Set Appendix. What should we do?

kmarsolo commented 6 years ago

The value set for Units in CDM v4.0 is based on UCUM. The universe of UCUM codes is essentially unbounded (http://unitsofmeasure.org/ucum.html#datyp2apdxatblxmp), so we have to have a finite list in order to test model conformance, unless we change the field type to text. The value set used in CDM v4.0 is based on the common UCUM units as identified by LOINC (https://loinc.org/usage/units/). Unit values that fall outside of this set should be mapped to OT with the source value placed in the RAW field. This is true even if it is possible to represent the unit with a "valid" UCUM code. We will consider revising this value set in the future based on the data that exist across the network.