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The enzyme unit, or international unit for enzyme (symbol U, sometimes also IU) is a unit of enzyme's catalytic activity. [ 1 ] 1 U (μmol/min) is defined as the amount of the enzyme that catalyzes the conversion of one micro mole of substrate per minute under the specified conditions of the assay method .
In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances. International units are used to quantify vitamins and biologics ( hormones , some medications , vaccines , blood products and similar biologically ...
Reference ranges for blood tests of plasma renin activity can be given both in mass and in international units (μIU/mL or equivalently mIU/L, improperly shown as μU/mL or U/L, confusing mcU/mL used where Greek μ not available), with the former being roughly convertible to the latter by multiplying with 11.2. [3]
For example, the US Adequate Intake recommendations from 1997 were 200 IU/day for infants, children, adults to age 50 and women during pregnancy or lactation, 400 IU/day for ages 51–70 and 600 IU/day for 71 and older. [168] Conversion: 1 μg (microgram) = 40 IU (international unit). [56]
The symbol g 0 is used to denote standard gravity in order to avoid confusion with the (upright) g symbol for gram. ... [Converter 1] approximately 365.242 19 d, ...
In the metric system, a microgram or microgramme is a unit of mass equal to one millionth (1 × 10 −6) of a gram.The unit symbol is μg according to the International System of Units (SI); the recommended symbol in the United States and United Kingdom when communicating medical information is mcg.
Enzyme activity is commonly used for e.g. liver function tests like AST, ALT, LD and γ-GT in Sweden. [5] Percentages and time-dependent units (mol/s) are used for calculated derived parameters, e.g. for beta cell function in homeostasis model assessment or thyroid's secretory capacity. [citation needed]
G, g gram(s) GFR glomerular filtration rate GI gastrointestinal GVHD graft-versus-host disease: G6PD glucose-6-phosphate dehydrogenase GU genitourinary Gy gray H, h, hr hour(s) '/24' is generally used in some regions. Hb hemoglobin HCl hydrochloric acid; hydrochloride HCO3 bicarbonate Hct hematocrit Hg mercury HIPAA