Preferred Label : International Unit;
NCIt synonyms : International Unit of Biological Activity; Unit International; F2;
NCIt related terms : [iU]; IE; international unit(s); INTERNATIONAL UNITS; IU; Unit; International Standard Unit;
NCIt definition : The unitage assigned by the WHO to International Biological Standards - substances,
classed as biological according to the criteria provided by WHO Expert Committee on
Biological Standardization (e.g. hormones, enzymes, and vaccines), to enable the results
of biological and immunological assay procedures to be expressed in the same way throughout
the world. The definition of an international unit is generally arbitrary and technical,
and has to be officially approved by the International Conference for Unification
of Formulae.;
Alternative definition : NCI-GLOSS: A unit used to measure the activity of many vitamins, hormones, enzymes,
and drugs. An IU is the amount of a substance that has a certain biological effect.
For each substance there is an international agreement on the biological effect that
is expected for 1 IU.; CDISC: The unitage assigned by the WHO (World Health Organization) to International
Biological Standards - substances, classed as biological according to the criteria
provided by WHO Expert Committee on Biological Standardization, to enable the results
of biological and immunological assay procedures to be expressed in the same way throughout
the world. The definition of an international unit is generally arbitrary and technical,
and has to be officially approved by the International Conference for Unification
of Formulae.(NCI);
FDA table : Potency (C-DRG-00501);
Codes from synonyms : 0072; CDR0000454523; CDR0000044764;
Origin ID : C48579;
UMLS CUI : C0439453;
Automatic exact mappings (from CISMeF team)
- Currated CISMeF NLP mapping
- Semantic type(s)
- UMLS correspondences (same concept)
- concept_is_in_subset
