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Basal and LH-RH induced plasma FSH and LH levels were determined longitudinally in 41 patients aged 4 to 22 years with Turner's syndrome and in 4 male patients with prepubertal castration. In 12 patients with Turner's syndrome over 18 yrs of age without pubertal change, basal and LH-RH induced FSH levels studied at age 11--22 yrs were all significantly increased over normal levels. However, some of these patients had normal basal and LH-RH induced LH levels. In 5 patients with mosaic Turner's syndrome with spontaneous puberty, basal and LH-RH induced FSH and LH levels studied at age 6--12 yrs were always within the normal range for age-matched controls. In 10 patients studied at age 11--18 yrs, basal and LH-RH induced FSH levels were also strikingly increased over normal levels except for one patient. This patient had normal basal FSH and LH levels and serum estradiol level was increased from 49 to 199 pg/ml after HMG test. In 14 patients aged 4--10 years, nine patients had elevated basal FSH levels and abnormally high responses to LH-RH. The remaining 5 patients had normal basal FSH levels, and 3 of them also had normal FSH responses to LH-RH. The data on the 5 patients studied again at the age of greater than 13 yrs rose to high levels in adult castrated ranges. In 24 patients aged 4 to 17 years, 23 patients were thought to have no ovarian function, and one was thought to have spontaneous puberty. In 4 male patients with prepubertal castration, basal and LH-RH induced FSH levels were increased over normal levels after 11 yrs of age. However, basal LH levels in some patients were within the normal range for age-matched controls after 12 yrs of age. From these results, we conclude that basal and LH-RH induced FSH levels may provide definitive evidence of absent ovaries or testes in patients over 11 yrs of age with primary hypogonadism.

Longitudinal Studies on Gonadotropin Levels in Patients with Turner's Syndrome and Patients with Prepubertal Castration