Magnesium is measured along with sodium, potassium, and chloride for Anion Gap analysis, However, approx. 1% magnesium is found in blood.
Magnesium deficiency closely mimics diabetes. Signs and symptoms of magnesium deficiency also leads to heart problems including chest tightness,
Other signs and symptoms of magnesium deficiency include cramps, fatigue, thirst and weight loss problems.
External links
http://www.healthyfoodhouse.com/magnesium-deficiency-these-are-the-symptoms/