| IU | immunizing unit; international unit; intrauterine; in utero; 5-iodouracil |
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| ACU | acquired cold urticaria; acute care unit; agar colony-forming unit; ambulatory care unit |
| BU | base of prism up; Bethesda unit; blood urea; Bodansky unit; bromouracil; burn unit |
| CICU | cardiac intensive care unit; cardiovascular inpatient care unit; coronary intensive care unit |
| CSU | casualty staging unit; catheter specimen of urine; central statistical unit; clinical specialty unit... |
| ICD-9 | International Classification of Disease, ninth revision |
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| ICHPPC | International Classification of Health Problems in Primary Care |
| ICIDH | International Classification of Impairments Disabilities and Handicaps |
| I.C.P.C. | International Classification of Primary Care |
| ICSD | International Classification of Sleep Disorders |
| corpus luteum hormone unit | The progestational activity of 1 mg of unit of progestational activity; standard preparation of pure progesterone. See: Clauberg test, Corner-Allen unit. Synonym: corpus luteum hormone unit, unit of luteinizing activity. (05 Mar 2000) |
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| critical care unit | A hospital facility for provision of intensive nursing and medical care of critically ill patients, characterised by high quality and quantity of continuous nursing and medical supervision and by use of sophisticated monitoring and resuscitative equipment; may be organised for the care of specific patient groups, e.g., neonatal or newborn ICU, neurological ICU, pulmonary ICU. Synonym: critical care unit. (05 Mar 2000) |
| CT unit | A unit of X-ray attenuation in each picture element of the CT image. See: Hounsfield unit. (05 Mar 2000) |
| haemolytic unit | The smallest quantity (highest dilution) of inactivated immune serum (haemolysin) that will sensitise the standard suspension of erythrocytes so that the standard complement will cause complete haemolysis. Synonym: amboceptor unit. (05 Mar 2000) |
| Haldane's evolutionary unit | <unit> A unit of measurement, given in darwins, which measures the increase in body size of a chronospecies over evolutionary time. (13 Nov 1997) |
| progesterone unit | The progestational activity of 1 mg of unit of progestational activity; standard preparation of pure progesterone. See: Clauberg test, Corner-Allen unit. Synonym: corpus luteum hormone unit, unit of luteinizing activity. (05 Mar 2000) |
| prolactin unit | The specific lactogenic activity contained in 0.1 mg of the standard preparation of the lactogenic substance of the anterior pituitary gland. (05 Mar 2000) |
| heparin unit | The quantity of heparin required to keep 1 ml of cat's blood fluid for 24 hr at 0캜; it is equivalent approximately to 0.002 mg of pure heparin. Synonym: Howell unit. (05 Mar 2000) |
| Schwann cell unit | A single Schwann cell and all of the axons lying in troughs indenting its surface; this unit regarded as an unmyelinated fibre in the peripheral nervous system. (05 Mar 2000) |
| high energy particle generating unit | A machine capable of providing highly energised radiation for the purposes of radiotherapy treatment. (16 Dec 1997) |
| Holzknecht unit | An obsolete unit of X-ray dosage equal to one-fifth of the erythema dose. (05 Mar 2000) |
| Hounsfield unit | A normalised index of X-ray attenuation based on a scale of -1000 (air) to +1000 (bone), with water being 0; used in CT imaging. (05 Mar 2000) |
| Howell unit | The quantity of heparin required to keep 1 ml of cat's blood fluid for 24 hr at 0캜; it is equivalent approximately to 0.002 mg of pure heparin. Synonym: Howell unit. (05 Mar 2000) |
| Sherman-Bourquin unit of vitamin B2 | The amount of vitamin B2 required in the diet daily to sustain an average weekly gain of 3 g for 8 weeks in standard test rats; one unit is equivalent to 1 to 7 ug (0.001 to 0.007 mg) of riboflavin, depending on the deficiency diet used in the above assay. (05 Mar 2000) |
| Sherman-Munsell unit | A rat growth unit; the daily amount of vitamin A which sustains a rate of gain amounting to 3 g a week in standard test rats. (05 Mar 2000) |