The usefulness of an oral calcium tolerance test in the choice of management of patients with idiopathic hypercalciuria.

We studied 40 patients with calcium urolithiasis and idiopathic hypercalciuria in an attempt to identify patients with an absorptive or renal type of hypercalciuria. An oral calcium tolerance test was performed in all patients, resulting in a rise in serum calcium in all cases (2.35 +/- 0.

The effect of age on the renal response to PTH infusion.

The renal responses to PTH infusion were compared in two age groups of healthy subjects. Basal nephrogenous cyclic AMP (NcAMP) was higher (1.68 +/- 0.