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Measurement of progesterone in serum. The rise and fall of serum progesterone in the ovarian cycle is shown in the diagram on page 28 of Overcoming Infertility. Often measured to check the occurrence of prior ovulation (see also premenstrual endometrial biopsy. Used to infer the onset of ovulation in ovulation induction or assisted conception programs, and attaches extra significance to an apparently raised serum LH in judging the onset of the LH surge during monitoring. The result should be available within 4 hours for these purposes
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