Magnesium Blood Test

Magnesium is an important mineral that plays a key role in many biological processes. A magnesium blood test can help determine if the levels of this mineral in the body are too low or too high. It may also be used to monitor the effectiveness of treatment for magnesium deficiency.

Preparation

A blood sample is usually taken from a vein in the arm or hand. Preparing for a magnesium blood test involves:

Fast for 8-12 hours prior to the test.
Stop taking certain medications such as diuretics and antacids for at least 48 hours prior to the test.
Tell the doctor if you are pregnant.
Drink plenty of fluids prior to testing.

Procedure

The procedure for a magnesium blood test is extremely simple. Upon arrival at the testing facility, a healthcare professional will insert a needle into your skin and draw a blood sample. The blood sample is then sent to a laboratory for analysis.

Types

There are two main types of magnesium blood tests:

Serum magnesium test: measures the amount of magnesium in the blood.
Ionized magnesium test: measures the amount of magnesium found in red blood cells.

Risks

A magnesium blood test is generally safe and carries a small risk of side effects. The most common side effects are pain, bruising, and bleeding at the injection site. Serious side effects are extremely rare.

Why is it Performed?

A magnesium blood test is often recommended if a person is suspected of having a magnesium deficiency, or if they are experiencing symptoms that may be related to a magnesium deficiency. These symptoms include fatigue, weakness, muscle cramps, nausea, and loss of appetite.

When is it Ordered?

A magnesium blood test may be recommended if a person has a medical condition that affects their body’s ability to properly absorb magnesium. This includes diseases of the digestive system, such as Crohn’s disease, or diseases of the kidneys, such as chronic kidney disease. Other medical conditions such as diabetes, hyperparathyroidism, and hypoparathyroidism may also be a factor in ordering a magnesium blood test.

Interpreting Results

Normal levels of magnesium for adults range between 1.7 and 2.2 milligrams per deciliter (mg/dL). If the results of the test indicate levels of magnesium that are higher or lower than this range, your doctor may recommend further tests.

Conclusion

A magnesium blood test is a simple and safe procedure that can help assess the amount of magnesium in the body and identify any deficiencies. Abnormal levels of magnesium can have serious health consequences, so it is important to get tested if you are having any symptoms that may be related to a magnesium deficiency.