Parathyroid function in recurrent calcium nephrolithiasis and chronic kidney failure before and after oral calcium loading

A case is presented of a female patient with recurrent calcium renal calculosis, chronic calculous pyelonephritis and chronic renal failure II degree to whom an oral calcium tolerance test was performed. The data of the test are characteristic for parathyroid hyperfunction. The possible cause of these changed is discussed. The conclusion is reached that the oral calcium tolerance test is of differential diagnostic value in patients with initial renal failure, too.