Magnesium Blood Test

Magnesium Blood Test

What Is a Magnesium Blood Test and Why Is It Done?

A magnesium (mag-NEEZ-ee-im) 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 plays a role in making protein and energy, and keeping bones strong.

Doctors may order the test if a child has:

• signs of low magnesium levels, like weakness, muscle cramps, twitching, or heart palpitations (an unusual heartbeat)
• a medical condition that makes abnormal magnesium levels more likely, like a kidney problem

Top Things to Know

• The magnesium test checks the level of a mineral called magnesium in the blood.
• Doctors may order it if a child has muscle cramps, weakness, or an unusual heartbeat.
• Kids might need to stop taking certain medicines or not eat or drink before the blood test.
• Your doctor can explain what it means if magnesium levels are too low or too high.

How Can I Help My Child Prepare for a Blood Test?

To help kids get ready for a blood test, find out if they need to fast (not eat or drink) or should stop taking medicines before the test. Explain what to expect during the test. If your child is nervous about it, work together on ways to stay calm. Deep breathing or even imagining being in a place that makes your child feel safe and relaxed can help.

What Do Magnesium Test Results Mean?

Your doctor will explain what the results of the magnesium test mean for your child. “Normal” blood levels of magnesium vary based on things like age and gender.

A low level of magnesium (magnesium deficiency) isn’t common, but it could be due to some medicines or conditions like certain kidney problems, celiac disease, or Crohn’s disease.

A high level of magnesium doesn’t happen often either, but it could be caused by problems with the kidneys, adrenal glands, or thyroid gland.

What Else Should I Know?

If the magnesium level is low or high, your child may need other tests.

If you have questions about the magnesium test or what the results mean, talk to your doctor.