The Guide to Use of SNOMED CT and LOINC together provides advice on combined use of SNOMED CT and LOINC. It includes specifications of the files used for distribution maps and expression constraints developed as part of the cooperative work between SNOMED International and Regenstrief Institute Inc.
Web browsable version: http://snomed.org/loinc
SNOMED CT Document Library: http://snomed.org/doc
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