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LHRH and Steroid Levels in Normal Ovulatory Women

From the Section of Reproductive Endocrinology. Department of Obstetrics and GynecologyU. School of Medicine, Endocrinology Section of the Medical Service and Endocrine Polypeptide Laboratories. Veterans Administration Hospital, and Department of Medicine at Tulane University School of Medicine, New Orleans, Louisiana

Abstract

Synthetic LHRH was given intravenously in a dose of 250 µg to a group of 7 normal women in different phases of the menstrual cycle. The LH response was more pronounced in the preovulatory and luteal phase than in the follicular phase of the cycle. The FSH response was less than that of LH and was the same in all phases of the cycle. No significant changes were observed in the plasma levels of estradiol 17-beta, progesterone, or testosterone for up to 6 hours as well as 24 hours after LHRH administration in any of the subjects studied. In 2 of 3 subjects, administration of LHRH in the luteal phase resulted in the prolongation of the cycle. No effect on cycle length was observed when LHRH was given at other times of the cycle. LHRH did not affect the length of the subsequent cycle regardless of the day of administration.