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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 ...
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 .
Ish-Shalom et al. [69] performed a study in elderly women to compare the efficacy and safety of a daily dose of 1500 IU to a weekly dose of 10 500 IU and to a dose of 45 000 IU given every 28 days for two months. They concluded that supplementation with vitamin D can be equally achieved with daily, weekly, or monthly dosing frequencies.
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]
In the UK: a ‘Safe Intake’ (SI) of 8.5–10 μg/d (340–400 IU/d) for infants < 1 year (including exclusively breastfed infants) and an SI of 10 μg/d (400 IU/d) for children aged 1 to <4 years; for all other population groups aged 4 years and more (including pregnant/lactating women) a Reference Nutrient Intake (RNI) of day10 μg (400 IU/d).
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Serum LDH > 350 IU/L; Serum AST > 250 IU/L; WBC count > 16000 cells/mm 3; Within 48 hours: ... LDH > 400 IU/L; AST > 250 IU/ 100 ml; WBC count > 18000 cells/mm 3 ...
For example, on a certain monitor, the horizontal distance between the upper limits for parathyroid hormone in pmol/L and pg/mL may be 7 cm, with the mass concentration to the right. A molar concentration of, for example, 5 pmol/L would therefore correspond to a mass concentration located 7 cm to the right in the mass diagram, that is ...