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Blood Test: Magnesium

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What Is a Blood Test?


What Is a Magnesium Test?

A magnesium test measures the amount of magnesium in the blood. Magnesium is a mineral that helps muscles, nerves, the immune system, and the heart work as they should. It also helps make protein and energy, and helps keep bones strong.

Why Are Magnesium Tests Done?

A magnesium test may be done if a child has signs of low magnesium levels, such as weakness, muscle cramps or twitching, or an abnormal heartbeat. It also might be done if a child has a medical condition that makes low magnesium levels more likely, such as a kidney problem.

How Should We Prepare for a Magnesium Test?



How Is a Magnesium Test Done?


  • clean the skin 
  • pull the blood sample into a vial or syringe





Can I Stay With My Child During a Magnesium Test?


How Long Does a Magnesium Test Take?


What Happens After a Magnesium Test?


When Are Magnesium Test Results Ready?


Are There Any Risks From Magnesium Tests?



If you have questions about the magnesium test, speak with your doctor or the health professional doing the blood draw.

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