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Magnesium (serum) Blood Test

Magnesium (serum) Blood Test


A test to measure magnesium levels in the blood serum. Magnesium is a mineral used by every organ in the body and is especially important for bones and muscles.
Blood sample 1 biomarker included Results estimated in 3 working days from sample receipt at lab
Magnesium (serum) Blood Test
Magnesium (serum) Blood Test
Magnesium (serum) Blood Test
Magnesium (serum) Blood Test
Magnesium (serum) Blood Test

What's included?

Biomarker profile

  • Minerals

Minerals (1 Biomarker)

From the expert

Magnesium is an important mineral needed for proper muscle, nerve, and enzyme function. It also helps the body make and use energy and is needed to move other electrolytes (potassium and sodium) into and out of cells. Most of the magnesium in the body is found in the bones and inside the cells. Only a tiny amount of magnesium is normally present in the blood.

This test can tell you if your magnesium levels are normal and whether you need to be eating more foods rich in magnesium to improve your levels. Magnesium is found in fibre-rich foods such as green leafy vegetables, avocados, bananas, wholemeal bread and brown rice as well as in fish and meat. Too much magnesium is often caused by over-supplementation or by taking too many antacids or milk of magnesia. 

Symptoms of excess magnesium include breathing problems, skin and eye irritation, flu-like symptoms and an upset stomach. Low magnesium can cause muscle twitching and cramps, fatigue, osteoporosis, an irregular heart beat and high blood pressure. Low magnesium is associated with heart disease, artherosclerosis, stroke and diabetes.

Dr Sam Rodgers MBBS, MRCGP
Chief Medical Officer

Why take this test?

  • You want to check you are getting enough magnesium in your diet
  • You have symptoms which you think may be caused by abnormal magnesium
  • You have a condition which affects your absorption of vitamins and minerals and you want to check your magnesium status
  • You take a magnesium supplement and you want to make sure your levels are optimal

Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert advice with your results

Get trusted advice and comments from one of our doctors based on your results.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help
Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.