Measures serum magnesium, a mineral involved in muscle function, nerve signalling and heart health. Suited to people with fatigue, cramps or low energy who want to check whether low magnesium could be a factor.
1 biomarker as listed by Medichecks.
This is a single-marker test that measures magnesium in your blood serum. Magnesium is involved in muscle function, nerve signalling and heart health, and low levels are sometimes linked to fatigue, cramps and low energy, though many other things can cause the same symptoms.
Within Medichecks' own magnesium comparison group, this test sits close to the middle of the price range. It costs £10 more than Forth's Magnesium Home Blood Test Kit (£45) and Blue Horizon Medicals' Serum Magnesium test (£45.25), both of which measure the same single marker, but it's substantially cheaper than Blue Horizon's Whole Blood Magnesium test at £136.25.
As a single-marker test, its clinical depth score reflects that it measures exactly what it claims to and no more, since depth is not really the point of a one-marker test like this. It scores well for convenience, since you can do it with an at-home finger-prick sample as well as clinic or nurse-visit options, and for follow-up, since results come with a doctor's comment.
This test suits people who want to check their magnesium level specifically, for example if they have muscle cramps, fatigue or low energy and want a quick, single-marker answer rather than a broader panel. If you'd rather pay less for the same single marker, Forth's Magnesium Home Blood Test Kit (£45) and Blue Horizon Medicals' Serum Magnesium test (£45.25) are cheaper alternatives that test the same thing.
If magnesium is only one of several things you want to check, a broader panel that includes other minerals and vitamins alongside it may work out better value than ordering several single-marker tests.
You can collect a finger-prick blood sample at home, or choose an in-store clinic visit, a home nurse visit, or a venous draw at a clinic. The lab measures magnesium in your blood serum, with results typically available within three days. A doctor adds a comment to your results before you see them.
At £55, this single-marker magnesium test sits close to the £50.13 median for the group it competes in. It costs £10 more than Forth's equivalent (£45) and Blue Horizon Medicals' Serum Magnesium test (£45.25), but it's far cheaper than Blue Horizon's Whole Blood Magnesium test at £136.25. Its main limitation is that it only tells you about one marker.
The listing publishes a short description, the full biomarker list, a stated turnaround, clear collection options, the sample type; it does not state what the report looks like.
A single-marker test measuring exactly what it sets out to; depth is not the point of this comparison group.
A finger-prick sample you take at home; with a venous or clinic option as well; a home nurse visit is offered; results in around 3 days, in line with or faster than similar tests.
Results are reviewed by a doctor; the provider does not describe the report format.
Trustpilot 4.5 from 2,477 reviews; accredited lab (UKAS ISO 15189 partner labs); doctor review as standard; trading 25+ years.
£55.00 against a comparison-group median of £50.13 (+10%).
Calculated 13 September 2026 from the facts we hold about this test and provider, using our published scoring formula. Scores are not hand-edited.
This test belongs to our Magnesium test comparison group. See how it stacks up against equivalent tests from other providers.
Closely matches the cheapest magnesium test on the market
Checks serum magnesium levels, a mineral linked to fatigue, muscle cramps and weakness when low.
Cheapest single-marker magnesium test we compare
A single-marker blood test that measures your serum magnesium level, suited to anyone who wants to check this one mineral rather than a full panel.
Priciest magnesium test in this group by some margin
This is a single blood test for magnesium, measured in whole blood rather than serum, which can give a more complete picture of the body's total magnesium level. It suits people who want the whole blood method specifically, rather than the more common serum test.
Closely matches the cheapest magnesium test on the market
Checks serum magnesium levels, a mineral linked to fatigue, muscle cramps and weakness when low.
Cheapest single-marker magnesium test we compare
A single-marker blood test that measures your serum magnesium level, suited to anyone who wants to check this one mineral rather than a full panel.
Priciest magnesium test in this group by some margin
This is a single blood test for magnesium, measured in whole blood rather than serum, which can give a more complete picture of the body's total magnesium level. It suits people who want the whole blood method specifically, rather than the more common serum test.
