Source:http://linkedlifedata.com/resource/umls/id/C0034760
UMD: Substances intended to detect and/or measure, in some cases producing or modifying other substances, a specific analyte of interest (e.g., enzymes, hormones). Substances used as reagents must be sufficiently pure to appropriately perform a specific analytical test. Reagents are typically used in the clinical laboratory for clinical chemistry, immunochemistry, hematology, microbiology (e.g., culture), infectious immunology, and molecular biology (e.g., nucleic acid technology) tests.,NCI: A substance used to carry out a laboratory test. Reagents may be used in a chemical reaction to detect, measure, or make other substances.,NCI: Any natural or synthetic substance used in a chemical or biological reaction in order to produce, identify, or measure another substance.