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Absence of effect of 24,25-dihydroxycholecalciferol on serum immunoreactive PTH in patients with persistent hyperparathyroidism after renal transplantation.

Three hypercalcemic renal transplant recipients with stable, excellent renal function (creatinine clearance 74 +/- 11.8 ml/min) were treated with 60 micrograms 24,25(OH)2D3 by mouth daily for three months. Immunoreactive c-terminal PTH, intact PTH, 1,25(OH)2D3, 25(OH)D3, 24,25(OH)2D3, and serum and 24 h urine calcium, phosphate, magnesium and creatinine were obtained before, at one week, one month and three months of treatment, and at six weeks post-treatment. Significant elevations in serum levels of 24,25(OH)2D3 were induced by therapy (1.32 +/- .16 ng/ml to 30.06 +/- 5.18 ng/ml at one month). Moderate elevations of c-terminal PTH and normal levels of intact PTH remained unchanged throughout the study. Serum calcium remained elevated, serum phosphate and magnesium remained depressed and creatinine clearance and urinary excretion of calcium, phosphate, and magnesium remained unchanged. Furthermore, 1,25(OH)2D3 and 25(OH)D3 remained in the normal range throughout the study. We conclude that 24,25(OH)2D3 did not have a suppressant effect on levels of iPTH in the clinical setting of persistent hyperparathyroidism after successful renal transplantation.