Kinetic differences of the calcium-binding protein in absorptive hypercalciuric renal stone formers.

Normal levels of 1.25-dihydroxycholecalciferol and different behaviour of the calcium binding protein kinetics, in a group of absorptive hypercalciuric stone formers indicate that intestinal calcium hyperabsorption in stone formers is due to an altered calcium transport at the intestinal level rather than a phosphate renal leak.