Abstract
Assessement of hypercalciuria is essential in children with urolithiasis and nephrocalcinosis, or demineralization of bone. It should be also a part of differential diagnostic procedure in hematuria, reccurent abdominal pain, urinary tract infection and enuresis in childhood.
Three case reports of children with hypercalciuria are presented with final diagnosis of idiopathic hypercalciuria, familial hypomagnesemia with hypercalciuria and nephrocalcinosis, and metabolic bone disease of prematurity.