[Radioimmunologic evaluation of the evolution and nature of hyperparathyroidism following allotransplantation of the kidney].

A study of the level of immunoreactive parathyrin in the peripheral blood of 81 patients after kidney allotransplantation (53 patients with satisfactory graft function and 28 patients after graft rejection) revealed hyperparathyroidism in 69.2% of the patients with satisfactory function and in 100% of the patients with chronic rejection of the kidney graft. With an increase in the postoperative period the involution of hyperparathyroidism was found only in half of the patients. In 66.1% of the patients hyperparathyroidism was of secondary nature, in 20.3%--of "tertiary" nature, and relative pseudohypoparathyroidism was observed in 13.5%.