Background: Chronic renal failure is commonly associated with disturbances in hypothalamic-pituitary-gonadal function. Methods: The gonadotrophins, prolactin and estradiol or testosterone levels were measured immediately before renal transplantation, at discharge from the transplantation unit (19 ± 8 days after Tx) and 6 months after transplantation in 21 patients, 7 females and 14 males, age range 21–60 years. Results: The mean prolactin level was high during uremia and decreased rapidly after transplantation, from 441 to 167 mU/l in males and from 1,057 to 521 mU/l in females. Hypergonadotrophism was seen in most uremic patients, with the mean LH and FSH levels of 14.2 and 6.0 U/l in males and 14.7 and 4.0 U/l in females, respectively. A temporary change to hypogonadotrophic hypogonadism took place 2–3 weeks after transplantation and was followed by normalization of the hypothalamic-gonadal function. The levels of circulating sex steroids were suppressed when the patients were discharged from the transplantation unit but returned to the normal range at 6 months. Conclusions: We conclude that renal transplantation corrects the hyperprolactinemia induced by uremia and is followed by rapid onset of restoration of the hypothalamic-pituitary-gonadal axis.

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