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Serum Gonadotropin Levels in Japanese Women

From the Department of Obstetrics and Gynecology, Tokyo Medical College. Tokyo. Japan.

Abstract

Plasma gonadutropin levels throughout the regular menstrual cycle in 10 Japanese women were measured daily using radioimmunoassay. At the peak of ovulation, mean FSII levels were 17.6 ± 7.9 mlU/ml and mean LH levels were 75.2 ± 26.0 mlU/ml. At midcycle, the mean gonadotropin levels were significantly loner in Japanese nomen than in Nigerian women who, as reported by Nylander (1973), had a high frequency of thinning. It is, therefore, suggested that the low frequency of ditygotic thinning in Japanese women might be related to their low output of gonadotropin.

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