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
This article was last reviewed on November 17, 2006.
This page was last modified on April 8, 2009.
The review date indicates when the article was last reviewed from beginning to end to ensure that it reflects the most current science. A review may not require any modifications to the article, so the two dates may not always agree.
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