Unit conversions between LOINC codes.
Logical Observation Identifiers Names and Codes (LOINC) is the most widely used controlled vocabulary to identify laboratory tests. A given laboratory test can often be reported in more than 1 unit of measure (eg, grams or moles), and LOINC defines unique codes for each unit. Consequently, an identical laboratory test performed by 2 different clinical laboratories may have different LOINC codes. The absence of unit conversions between compatible LOINC codes [...]
Author(s): Hauser, Ronald G, Quine, Douglas B, Ryder, Alex, Campbell, Sheldon
DOI: 10.1093/jamia/ocx056