The Unified Code for Units of Measures is very stable in content and has already been adopted by some standard organizations such as DICOM, HL7 and has been referenced as best practice by the Open Geospatial Consortium in their Web Map Service (WMS) and Geography Markup Language (GML) implementation specifications. We are still looking for the best way to establish this specification as a widely used industry standard. The official status and the affiliation may change during that process. However, we try to keep as much as possible of the specification freely available and redistributable to assure the maximum use and benefit. We would also like to keep this specification maintainable and flexible to updates. Although the initial version contains more than 250 terminal unit symbols (more than three times as many symbols as in ANSI X3.50), there are areas that are not covered completely yet.

	The Regenstrief Institute provides the UCUM specification electronically so that the printed version is guaranteed to contain consistent and tested data that is free from severe name conflicts or random errors.
	UCUM Specification - HTML UCUM Specification in HTML format. File type: text/html
	UCUM Specification - XML Excerpt of the UCUM Specification in XML format. This is the formal part of the specification in a format intended for machine processing. The XML format enables better sorting and indexing capabilities, etc. File type: text/xml
	Archived Documents
	UCUM Specification - PDF UCUM Specification in PDF format. This document is available for historical purposes. Please note that important updates have been issued since this was released. File Version: 1.4b | Release Date: 2002-06-06  | File type: application/pdf