Magnesium, Serum

Serum magnesium testing measures circulating magnesium levels, an essential electrolyte involved in neuromuscular function, cardiac rhythm, and enzymatic activity. Abnormal levels may be associated with renal disease, gastrointestinal disorders, endocrine abnormalities, or medication effects. This test is commonly used to assess electrolyte imbalance, monitor critically ill patients, and guide magnesium supplementation therapy.