The Importance of Circulating 1,25-Dihydroxyvitamin D in the Pathogenesis of Hypercalciuria and Renal-Stone Formation in Primary Hyperparathyroidism

Abstract
Fifty patients with primary hyperparathyroidism were studied with an oral calcium-tolerance test, measurements of plasma levels of vitamin D metabolites, and determination of calcium excretion on both a low-normal (400 mg) and high-normal (1000 mg) daily calcium intake.