The Magnesium (Mg) test measures the amount of magnesium circulating in your blood serum. Magnesium is an essential mineral and electrolyte, second only to potassium as the most abundant positively charged ion within the body's cells.
Magnesium is critical for over 300 enzyme systems that regulate diverse biochemical reactions, including:
This test is often ordered when a patient has unexplained low levels of potassium or calcium, muscle weakness, or abnormal heart rhythms