Why do I need a magnesium blood test?Your health care provider may order a magnesium blood test if you have symptoms of low magnesium or high magnesium levels.Symptoms of low magnesium include:WeaknessMuscle cramps and/or twitchingConfusionIrregular heartbeatSeizures (in severe cases)Symptoms of high magnesium include:Muscle weaknessFatigueNausea and vomitingTrouble breathingCardiac arrest, the sudden stopping of the heart (in severe cases)You may also need this test if you are pregnant. A magnesium deficiency can be a sign of preeclampsia, a serious form of high blood pressure that affects pregnant women.In addition, your provider may order this test if you have a health problem that can cause a magnesium deficiency. These include malnutrition, alcoholism, and diabetes.
