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Immunoassay reagents intended to perform qualitative and/or quantitative analyses of a sample of body fluids (typically serum) to determine progesterone, a female sex hormone that in conjunction with estrogen regulates the accessory organs during the menstrual cycle. Progesterone is essential for maintaining pregnancy and human reproduction. Typically both free and bound fractions of progesterone are measured. Progesterone levels are associated with preparation and maintenance of pregnancy. Its level varies during the menstrual cycle and throughout pregnancy.
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