international unit

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1. a single thing; one segment of a whole that is made up of identical or similar segments.
2. a specifically defined amount of anything subject to measurement, as of activity, dimension, velocity, volume, or the like.
3. a distinct part of a hospital, usually having a specific physical location and serving a defined function; see under names of specific units.
Ångström unit angstrom.
atomic mass unit (u) (amu) the unit of mass equal to ¹⁄₁₂ the mass of the nuclide of carbon 12. Called also dalton.
autonomous nursing unit a nursing unit under a decentralized administration system in which the staff is responsible for all aspects of unit functioning.
British thermal unit (BTU) a unit of heat formerly widely used, being the amount necessary to raise the temperature of 1 pound of water from 39° to 40°F., equal to approximately 252 calories.
CH50 unit the amount of complement that will lyse 50 per cent of a standard preparation of sheep red blood cells coated with antisheep erythrocyte antibody.
continuing education unit (CEU) a unit of credit for educational offerings given to professional persons, determined by a professional organization according to a mathematical formula after a thorough review of the program of study, the qualifications of the instructors, and the program objectives.
critical care unit intensive care unit.
electrostatic u's (esu) that system of units that is based on the fundamental definition of a unit charge as one that will repel a similar charge with a force of 1 dyne when the two charges are 1 cm apart in a vacuum.
environmental control unit a computerized system that allows the handicapped individual to operate several different appliances using a keyboard or other input device.
heat unit the amount of heat energy that is produced by one kVp (kilovolt peak) and one mA (milliampere) for one second with single phase, full wave rectified radiographic equipment.
Hounsfield unit an arbitrary unit of x-ray attenuation used for CT scans. Each voxel is assigned a value on a scale in which air has a value of −1000; water, 0; and compact bone, +1000.
intensive care unit see intensive care unit.
International unit (IU)
1. a unit of enzyme activity equal to the amount of enzyme that catalyzes the conversion of one micromole of substrate or coenzyme per minute under specified conditions (temperature, pH, and substrate concentration) of the assay method. Abbreviated U.
2. any of several arbitrary units that have been adopted by international bodies to express the quantities of certain vitamins (A, C, D, and thiamine hydrochloride), hormones (androgen, chorionic gonadotropin, estradiol benzoate, estrone, insulin, progesterone, and prolactin), and drugs (digitalis and penicillin).
Kienböck's unit a unit of x-ray exposure equal to 0.1 erythema dose; symbol X.
motor unit the unit of motor activity formed by a motor nerve cell and its many innervated muscle fibers.
postanesthesia care unit (PACU) a specialty unit in a hospital for giving postanesthesia care (care of patients recovering from anesthesia and intravenous sedation); formerly called recovery room.
radiologic u's units used to measure radiation, including roentgens, rads, rems, and curies.
u's of service (UOS)
1. the number of procedures done by a department.
2. individuals or groups of individuals who are the recipients of nursing care.
short procedures unit (short term care unit) a nursing unit where patients are briefly cared for following a medical or surgical procedure and are then discharged without spending the night.
SI unit any unit of the International System of units (the metric system); see also si units.
step-down unit a nursing unit designated to provide care for patients who are stable enough to be discharged from the intensive care unit but are not yet ready to be cared for on a medical-surgical unit.
Svedberg unit (S) a unit equal to 10−13 second used for expressing sedimentation coefficients of macromolecules.
Svedberg flotation unit (Sf) a unit equal to 10−13 second used for expressing negative sedimentation coefficients of macromolecules that float rather than sink in a centrifuge, e.g., lipoproteins.
terminal respiratory unit the functional unit of the lung, including a respiratory bronchiole, alveolar ducts and sacs, and alveoli; called also primary lobule of lung and primary respiratory lobule.
USP unit one used in the United States Pharmacopeia for expressing potency of drugs and other preparations.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

in·ter·na·tion·al u·nit (IU),

the amount of a substance, such as a drug, hormone, vitamin, enzyme, etc., that produces a specific effect as defined by an international body and accepted internationally; for example, for an enzyme it is micromoles of product formed (or substrate consumed) per minute.
Farlex Partner Medical Dictionary © Farlex 2012

international unit

n. Abbr. IU
1. The quantity of a biologically active substance, such as a hormone or vitamin, required to produce a specific response.
2. A unit of potency for similarly active substances, based on this quantity and accepted as an international standard.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

international unit

Any arbitrarily defined and internationally sanctioned unit of measurement for a naturally-occurring substance–eg, hormone, enzyme or vitamin. See SI Therapeutics Drug concentrationin–µg/mL X 103/MW of drug–g/mole.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

in·ter·na·tion·al u·nit

(in'tĕr-nash'ŭn-ăl yū'nit)
The amount of a substance (e.g., drug, hormone, vitamin, enzyme) that produces a specific effect as defined by an international body and accepted internationally.
Synonym(s): unit (4) .
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

International unit (IU)

A measurement of biological activity in which one IU is equal to one mg (milligram).
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

in·ter·na·tion·al u·nit

(IU) (in'tĕr-nash'ŭn-ăl yū'nit)
Amount of a substance (e.g., drug, hormone, vitamin, enzyme) that produces specific effect as defined and accepted internationally.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
We need a minimum of 800 International Units per day.
The other international units that debuted last year were in Tainan and North Kaohsiung, Taiwan, and Maebashi Gunma, Japan.
The recommended daily allowance of vitamin D is 400 International Units for adults ages 51-70, and 15 micrograms (600 International Units) for adults 71 and older.
DUBAI: Qatar Islamic Bank plans to list its international units on their local exchanges as it looks to develop Islamic banking hubs across the world, reports said yesterday.
Researchers gave 1,179 Nebraska women over age 55 daily doses of vitamin D (1,100 International Units) plus calcium (1,400 to 1,500 milligrams), calcium alone, or a placebo.
A study published in the June 8, 2007 issue of the American Journal of Clinical Nutrition reports that 1,000 international units (IUs) of vitamin D per day plus calcium can reduce several types of cancer by as much as 60 percent in older women.
A four-year clinical trial of 1,200 women in northern latitudes found that Vitamin D supplements of 1,100 International Units (IU) per day reduced their incidence of cancer by a remarkable 60 percent.
The study, A Higher Dose of Vitamin D Reduces the Risk of Falls in Nursing Home Residents, was conducted over five months and found that subjects taking 800 International Units (IU) of Vitamin D had a 72% decrease in falls compared with those taking a placebo.
The positive results obtained so far gives the necessary support to the next phase, which will be extended to the international units and to affiliate and subsidiary companies in the CVRD group.
Vitamin C 500 milligrams Vitamin E 400 International Units Zinc oxide 80 milligrams Copper 2 milligrams Beta Carotene 15 milligrams (equivalent to 25,000 International Units of vitamin A)
FiberChoice plus Calcium chewable tablets offer a 4-gram dose of fiber, 500 mg of calcium and 200 international units (IUs) of vitamin D.

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