The 88 patients included in the in vitro fertilization program during 113 cycles were submitted to superovulation by sequential use of clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin. No correlation was found between estradiol and progesterone levels during the luteal phase and estradiol on the days preceding administration of human chorionic gonadotropin. Nineteen biopsies of the endometrium were carried out. The importance of the increase of estradiol between the day before and the day of administration of human chorionic gonadotropin is positively correlated with the quality of the endometrium.
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