Magnesium Effects, Dosage, and Side Effects
In medicine, a mineral used by the body to help maintain muscles, nerves, and bones. It is also used in energy metabolism and protein synthesis.
... Why get tested?
To evaluate the level of magnesium in your blood and to help determine the cause of abnormal calcium and/or potassium levels
When to get tested?
If you have symptoms (such as weakness, irritability, cardiac arrhythmia, nausea, and/or diarrhea) that may be due to too much or too little magnesium or if you have abnormal calcium or potassium levels
A blood sample drawn from a vein in your arm
Lab Tests Online - more...
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Wikipedia - [full article]