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The release of luteinizing hormone (LH) during treatment with purified sheep follicle stimulating hormone (FSH) without signs of adequate follicular maturation in women is reported. 4 women with amenorrhoea for 2-7 years were treated with the FSH preparation. Plasma progesterone estradiol and LH concentrations were measured every 24 or 48 hours during 15-30 days of treatment. A LH peak was found in all 4 women even though in 3 of them there was no evidence of adequate follicu lar maturation as assessed by estradiol levels. These results indicate that an estradiol peak need not necessarily be the unique stimulus for LH release and the possibility that FSH in humans can stimulate LH release directly through a short loop feedback mechanism should not be disregarded.

RELEASE OF LH DURING TREATMENT WITH PURIFIED SHEEP FSH WITHOUT SIGNS OF ADEQUATE FOLLICULAR MATURATION IN WOMEN