Send to

Choose Destination
J Am Med Inform Assoc. 2018 Feb 1;25(2):192-196. doi: 10.1093/jamia/ocx056.

Unit conversions between LOINC codes.

Author information

Veterans Affairs Connecticut Healthcare, West Haven, CT, USA.
Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT, USA.
Main Laboratory, Bridgeport Hospital, Bridgeport, CT, USA.
Children's Foundation Research Institute, Le Bonheur Children's Hospital, Memphis, TN, USA.
Department of Pediatrics and Department of Pathology, University of Tennessee Health Science Center, Memphis, TN, USA.


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 impedes data aggregation and analysis of laboratory results. To develop such conversions, a computational process was developed to review the LOINC standard for potential conversions, and multiple expert reviewers oversaw and finalized the conversion list. In all, 285 bidirectional conversions were identified, including conversions for routine clinical tests such as sodium, magnesium, and human immunodeficiency virus (HIV). Unit conversions were applied to the aggregation of laboratory test results to demonstrate their usefulness. Diverse informatics projects may benefit from the ability to interconvert compatible results.


LOINC; clinical laboratory information systems; controlled vocabulary

Supplemental Content

Full text links

Icon for Silverchair Information Systems Icon for PubMed Central
Loading ...
Support Center