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The Menopausal Transition: Analysis of LH, FSH, Estradiol, and Progesterone Concentrations During Menstrual Cycles of Older Women

Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Iowa Iowa City, Iowa

Reprints: Dr. B. Sherman, Department of Internal Medicine, University Hospitals, Iowa City, Iowa 52242.

Studies of menstrual cycle length in large populations demonstrated that there is a striking increase in the variability of intermenstrual intervals just before menopause. The changes in serum concentrations of luteinizing hormone (LH), follicle-stimulating hormone (FSH), estradiol (E₂), and progesterone (P) during menstrual cycles in a group of perimenopausal women were compared with the findings in young normal women.

In 8 women, 46–56 years old with regular cycles, cycle length was shorter and the mean E2 concentration was lower than in younger women. There was a striking increase in FSH concentration throughout the cycle while LH remained in the normal range. In 2 women, 14 cycles of variable length were studied during 2 years of the menopausal transition. In some instances, hormonal changes associated with follicular maturation and corpus luteum function occurred in the presence of high, menopausal levels of LH and FSH with a diminished secretion of E₂ and P. In others vaginal bleeding occurred during a fall in serum E₂ with no associated rise in P.

Cycles of variable length during the menopausal transition may be due either to irregular maturation of residual follicles with diminished responsiveness to gonadotropin stimulation, or to anovulatory vaginal bleeding that may follow estrogen withdrawal without evidence of corpus luteum function.

The observation of elevated FSH concentrations and normal LH levels in perimenopausal women emphasizes the complexity of the hypothalamicpituitary-ovarian regulatory system and suggests that LH and FSH are modulated independently at the level of the pituitary.

Supported by Public Health Service Grants CA-15104 from the National Cancer Institute, and RR59 from General Clinical Research Centers Branch.

^* Dr. Korenman's present address is Department of Internal Medicine, UCLA School of Medicine, Veterans Administration Hospital, Sepulveda, California 91343.

Received July 1, 1975.

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