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

Sample required?
A blood sample drawn from a vein in your arm