Magnesium (Mg)

Also known as: Magnesium; Mag
Formal name: Magnesium
Related tests: Calcium, Potassium, Phosphorus, Parathyroid hormone (PTH), Vitamin D

• Why should I do it?

To evaluate the level of magnesium in your blood and to help determine the cause of abnormal calcium and/or potassium levels

• When should I do it?

When you have symptoms such as weakness, irritability, cardiac arrhythmia, nausea, and/or diarrhea that may be due to too much or too little magnesium; when you have abnormal calcium or potassium levels

• What Kind of Sample is Needed?

A blood sample drawn from a vein in your arm

• Test Preparation Needed?

Overnight fasting may be required; follow any instructions that you are given.