A magnesium test is done to assess magnesium levels in the
blood. Magnesium, a mineral obtained mostly from food, helps
the: muscles and nerves function heart maintain normal rhythm
bones stay strong body process energy and make proteins Why It's
Done Doctors may order a magnesium test to help diagnose or
monitor: kidney problems (whether the kidneys are excreting or
retaining too much magnesium) gastrointestinal and nutritional
conditions (problems with intestinal absorption or malnutrition)
abnormal heart rhythm muscle problems, such as cramping,
twitching, or weakness low calcium or potassium levels (because
magnesium works closely with other minerals, its levels can
directly affect the body's overall chemical balance) No special
preparations are needed for this test. However, certain drugs —
especially those that contain magnesium, such as some antacids
and laxatives — might alter the test results, so tell your
doctor about any medications your child is taking. On the day of
the test, having your child we