Magnesium deficiency in children with urolithiasis.

In a group of 57 children with urolithiasis hypomagnesaemia was found in 15 cases (26.3%). All children but one with abnormally low serum magnesium levels had recurrent or bilateral nephrolithiasis or nephrocalcinosis. Prevalence of hyperoxaluria and hypercalciuria, marked severity of the clinical features, abnormality of Ca metabolism and its responsiveness to MgO treatment were demonstrable in Mg deficiency.