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Serum gonadotropin levels in Japanese women.
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1975
Year
FertilityGeneticsReproductive HealthGynecologyFemale Reproductive SystemFemale Reproductive FunctionHigh FrequencyReproductive BiologyMenstrual CycleReproductive EndocrinologyFemale InfertilitySerum Gonadotropin LevelsReproductive MedicineWomen's PhysiologyPublic HealthReproductive HormoneInfertilityEndocrinologyOvarian HormonePlasma Gonadotropin LevelsRegular Menstrual CycleMedicineWomen's HealthGonadotropin Biology
Plasma gonadotropin levels throughout the regular menstrual cycle in 10 Japanese women were measured daily using radioimmunoassay. At the peak of ovulation, mean FSH 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 lower in Japanese women than in Nigerian women who, as reported by Nylander (1973), had a high frequency of twinning. It is, therefore, suggested that the low frequency of dizygotic twinning in Japanese women might be related to their low output of gonadotropin.