| IRC | inspiratory reserve capacity; instantaneous resonance curve; International Red Cross; International ... |
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| ISC | immunoglobulin-secreting cells; insoluble collagen; International Society of Cardiology; Internation... |
| ISE | inhibited sexual excitement; International Society of Endocrinology; International Society of Endosc... |
| ISI | infarct size index; initial slope index; injury severity index; Institute for Scientific Information... |
| ISMED | International Society on Metabolic Eye Disorders ISMH International Society of Medical Hydrology |
| tetanus antitoxin unit | The antitoxin activity of 0.3094 mg of standard tetanus antitoxin. (05 Mar 2000) |
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| thiamin hydrochloride unit | The antineuritic activity of 0.003 mg of the standard crystalline vitamin B1 hydrochloride. Synonym: vitamin B1 hydrochloride unit. (05 Mar 2000) |
| electromagnetic unit | The unit in an absolute system (CGS) of unit's utilizing the magnetic effects of current; e.g., abampere, abfarad, abhenry, abohm, abvolt. (05 Mar 2000) |
| Todd unit | The unit in which the results of testing for antistreptolysin O (ASO) are expressed. It denotes the reciprocal of the highest dilution of test serum at which there continues to be neutralization of a standard preparation of the streptococcal enzyme streptolysin O. (05 Mar 2000) |
| electrostatic unit | The unit in an absolute system (CGS) of unit's utilizing static electricity; e.g., statampere, statcoulomb, statfarad, stathenry, statvolt. (05 Mar 2000) |
| toxic unit | A unit formerly synonymous with minimal lethal dose but which, because of the instability of toxins, is now measured in terms of the quantity of standard antitoxin with which the toxin combines. See: L doses, minimal lethal dose. Synonym: toxin unit. (05 Mar 2000) |
| transcription unit | <molecular biology> A region of DNA that is transcribed to produce a single primary RNA transcript, i.e. A newly synthesised RNA molecule that has not been processed. Transcription units can be mapped by kinetic studies of RNA synthesis and in some instances directly visualised by electron microscopy. (17 Mar 1998) |
| equine gonadotropin unit | <veterinary> The specific gonadotropic activity of 0.25 mg of standard preparation of the gonadotropic principle of pregnant mares' serum. (05 Mar 2000) |
| estradiol benzoate unit | The oestrogenic activity of 0.1 ug of a standard preparation of estradiol benzoate. (05 Mar 2000) |
| estrone unit | The oestrogenic activity of 0.1 ug (0.0001 mg) of a standard preparation of crystalline estrone. (05 Mar 2000) |
| Jenner-Kay unit | That amount of phosphatase that liberates 1 mg of phosphorus; approximately 2 Bodansky unit's or 1 King unit. (05 Mar 2000) |
| Karmen unit | A formerly used enzyme unit for aminotransferase activity; a change of 0.001 in the absorbance of NADH/min. (05 Mar 2000) |
| Kienbock's unit | An obsolete unit of X-ray dosage equivalent to 1/10 the erythema dose. (05 Mar 2000) |
| King-Armstrong unit | The quantity of phosphatase that, acting upon disodium phenylphosphate in excess, at pH 9 for 30 min, liberates 1 mg of phenol. Synonym: King-Armstrong unit. (05 Mar 2000) |
| King unit | The quantity of phosphatase that, acting upon disodium phenylphosphate in excess, at pH 9 for 30 min, liberates 1 mg of phenol. Synonym: King-Armstrong unit. (05 Mar 2000) |