Serum pituitary gonadotropins during the menstrual cycle, measured by radioimmunoassay

Abstract

Radioimmunoassay techniques being used, have determined the levels of serum LH and FSH through the menstrual cycle, 15 cycles of 12 normal women of reproductive age (23-35 years). Eleven women had a rise in LH levels at mid-cycle (days 12-21). Six of these women also had significantly elevated levels of FSH, LH coincide with, and one woman had an elevation of FSH a day after the rise in LH. The highest level of LH achieved ranged from 33.5 to 160 mIU / ml. IRP-HMG-2 (mean ± is 90.8 ± 10.9) and FSH fluctuated between 26.5 and 44.0 mIU / ml. (Average is 31.6 ± ± 2.5). The levels of LH and FSH during the follicular phase (LH and FSH 19.5 16.3 -1 3.2 ± 2.1) were higher than in the luteal phase (LH FSH 9.5 ± 3.5 7.7 ± 3.1). FSH / LH ratio was lower during the ovulatory phase (0.35) during the first (0.83) and last days (0.81) of the cycle.