10 mL (5 mL min.) aliquot of 24-hour Urine in a sterile screw capped container. Do not use preservatives. Record 24-hour volume on test request form and urine container. Ship refrigerated or frozen.
Magnesium is a cofactor of many enzyme systems. Decreased renal function as in dehydration, Diabetic acidosis ; Addisonâ€™s disease, reduces the urinary excretion of magnesium. Chronic glomerulonephritis, Aldosteronism ; Drugs like Cyclosporine enhance excretion. This assay is useful for assessing the cause of abnormal serum magnesium concentration and determining whether body is receiving adequate nutrition.