The cycles of 11 renal transplant recipients (RTR), at least 24 months after stabilization of graft function and four hemodialyzed (HD) patients, menstruating regularly, were evaluated by concurrent and systematic determinations throughout the cycle of LH, FSH, estradiol, progesterone, testosterone, prolactin and SHBG and in the case of RTR also by ultrasound follow-up. Biphasic estradiol secretion, midcycle LH and FSH surge, duration of luteal phase, midluteal progesterone values and in the case of RTR, ultrasonic parameters were consistent with: (1) normal ovulatory cycles in five RTR; (2) ovulatory cycles with luteal phase deficiency in five RTR and two HD patients; (3) anovulatory cycles in one RTR and two HD patients. Thus, in HD patients only abnormal cycles of central etiology were found, while in RTR, luteal phase deficiency was a very common syndrome, in equal percentage with normal ovulatory cycles.
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