Unit, international (IU)
An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines). The definition of an international unit (IU) is generally arbitrary, technical, and eminently forgettable. For example, an IU of vitamin E is the specific biological activity of 0.671 milligrams of d-alpha-tocopherol. Nonetheless, most IUs are quite handy and helpful in use as a means of standardizing measures. All international units are officially defined by the International Conference for Unification of Formulae.

Medical dictionary. 2011.

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  • IU — Abbreviation for international unit. * * * immunizing unit; infection unit; integral uniformity; international unit; intrauterine; in utero; 5 iodouracil * * * IU abbr 1) immunizing unit 2) international unit * * * International unit (on the… …   Medical dictionary

  • IU — may mean: *Indiana University (most often the flagship campus in Bloomington) *a misnomer for IUP, Indiana University of Pennsylvania *Intermediate Unit, a regional educational service agency in Pennsylvania *International unit, a unit for… …   Wikipedia

  • international unit — (IU)    a unit used to measure the activity (that is, the effect) of many vitamins and drugs. For each substance to which this unit applies, there is an international agreement specifying the biological effect expected with a dose of 1 IU. Other… …   Dictionary of units of measurement

  • IU — International Unit. 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… …   English dictionary of cancer terms

  • International Unit — IU. 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… …   English dictionary of cancer terms

  • IU — steht für: Internationale Einheit (international unit), wenig gebräuchliche Einheit für Stoffmengen Izquierda Unida, spanische Partei Indiana University, Universität in Bloomington, Indiana, USA International University in Germany, Universität in …   Deutsch Wikipedia

  • international unit — n the amount of specific physiological activity of a standardized preparation (as of a vitamin) that is agreed upon as an international standard esp. for comparison with other biologicals containing the substance in impure form or with a related… …   Medical dictionary

  • IU — or iu abbrev. international unit(s) …   English World dictionary

  • IU — es el acrónimo de: Izquierda Unida, la denominación de varias coaliciones políticas en países de habla hispana; Acrónimo de Indiana University, la Universidad de Indiana; La Unidad internacional (en inglés, International Unit) en farmacología; El …   Wikipedia Español

  • International unit — In pharmacology, the International Unit is a unit of measurement for the amount of a substance, based on biological activity or effect. It is abbreviated as IU, as UI (Spanish unidad internacional or French unité internationale or Italian unità… …   Wikipedia

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