To evaluate electrolyte disorders, hypocalcemia, hypokalemia, and acid-base imbalance
To monitor patients who have cardiac disorders
To monitor the pregnant patient with severe toxemia during the intravenous administration of magnesium sulfate when the serum value is abnormal, the urine tested to obtain additional data
Serum:
Advanced renal failure
Addison's disease
Administration of multiple magnesium sulfate enemas
Excessive ingestion of magnesium-containing antacids
