49 MAGNESIUM METABOLISM IN CHRONIC PRIMARY HYPOMAGNESEMIA (CPHMg)

Metabolic studies were performed during a two year follow-up of a male child, born from consanguineous parents, with CPHMg and secondary hypocalcemia, but with normal growth and development. When 12 and 24 mo. old the Mg supplement was withdrawn.At 12mo. the urinary excretion of Mg was 0.9 mEq during 6 days and of these, 0.8mEq were excreted in the first day. Plasma Mg fell from 1.56 to 0.7 mEq/l in the first day and retention was only 0.01 mEq/Kg/day.