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Magnesium Test

Magnesium is a mineral found mainly in the bone, but it can also be seen in the blood. It is used for energy production, muscle contraction and for maintaining strong bones. The body regulates the magnesium levels by regulating the amount being absorbed from the intestines and the amount being excreted in the urine. Magnesium tests are used to investigate the severity of kidney problems as well as diagnosing and monitoring gastrointestinal disorders.

Frequently Asked Questions

What will be tested?


Preparing for the test

There is no need to fast (go without food or drinks) for this test.

We do suggest keeping your arm warm, as being cold can sometimes make it harder to draw your blood, and stay well hydrated.

If blood tests make you anxious, let your phlebotomist know at the start of your appointment. They will do their best to make the experience as stress-free as possible

What to expect

During your test, you will be asked to fill out a medical questionnaire to  make sure you are well enough for the test. The main part of your screen will be a simple venous blood test (where blood is drawn from a vein in your arm using a needle). This should only take a minute or two to complete.


You would receive your results via email with the in-house GP's review to allow you to understand your results.

When do I get my results?

You will receive your results on the two days after the blood sample is taken as the sample is received by the laboratory the following day.

London laboratory test all samples as quickly as possible after receiving them which enables the team of in-house GPs to review and communicate your results in the fastest possible time frame.

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