Collect 10mL random urine/0.5mL minimum in a sterile screw-capped container.
Inductively Coupled Plasma/Mass Spectrometry (ICP/MS)
Room Temperature 4 days, Refrigerated 7 days, Frozen 90 days
3-5 days Setup Tues-Fri
Magnesium urinary excretion is enhanced by increasing blood alcohol levels, diuretics, Bartter syndrome, corticosteroids, cis-platinum therapy and aldosterone. Renal magnesium wasting occurs in renal transplant recipients who are on cyclosporine and prednisone. Renal conservation of magnesium is diminished by hypercalciuria, salt-losing conditions, and the syndrome of inappropriate secretion of antidiuretic hormone.