Elevated values here serve as an indication of chorionic carcinoma, hydatiform mole or multiple pregnancy. The determination of hCG in the 1st trimester of pregnancy is of particular importance. Make use of a simple formula: Amount in IU Amount in mcg 3.33 IU/mcg. Measurement of the hCG concentration permits the diagnosis of pregnancy just one week after conception. Find the conversion factor for vitamin A ( retinol ): 3.33 IU/mcg. Vitamin A 1 IU 0. The serum of pregnant women contains mainly intact hCG. The information below provides an approximate vitamin conversion from standardized units (IU, RAE, DFE, NE) to milligrams or micrograms. The biological action of hCG serves to maintain the corpus luteum during pregnancy. Human chorionic gonadotropin consists of a number of isohormones with differing molecular size. The α‐chains in all four of these glycoprotein hormones are virtually identical, whereas the β‐chains have greatly differing structures and are responsible for the respective specific hormonal functions. The equivalents of 1 IU for selected vitamins are:Vitamin A: 1 IU is the biological equivalent of 0.3 mcg retinol, or of 0.6 mcg beta-caroteneVitamin D: 1 IU is the biological equivalent of 0.025 mcg cholecalciferol or ergocalciferolVitamin E: 1 IU is the biological equivalent of 0.67 mg d-alpha-tocopherol, or 0.9 mg of dl-alpha-tocopherol. Similarly to LH, FSH and TSH, human chorionic gonadotropin (hCG) is a member of the glycoprotein family and consists of 2 subunits (α‐ and β‐chains) which are associated to the intact hormone.
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