Checks serum magnesium levels, a mineral linked to fatigue, muscle cramps and weakness when low.
1 biomarker as listed by Blue Horizon Medicals.
This test measures magnesium in your serum, a mineral involved in several hundred processes in the body. Low levels can be linked to fatigue, muscle weakness, cramps or spasms, and testing is commonly considered when reduced intake or a deficiency is suspected.
Depth is not really the point for this comparison group, since all three magnesium tests we track, including this one, measure the single marker; the clinical depth score here reflects that it measures exactly what it sets out to rather than being narrow. On price it undercuts the group median of £50.13 by around 10% at £45.25, coming in close to Forth's £45 Magnesium Home Blood Test Kit and cheaper than Medichecks' £55 version. Blue Horizon's own Whole Blood Magnesium test, by contrast, costs £136.25 for the same mineral measured a different way.
Collection convenience scores a perfect 10, since you can test at home with a finger-prick or Tasso autodraw kit, or opt for a clinic or nurse home visit, with results back in around a day. The listing is thoroughly documented, and results are reviewed by a doctor. Blue Horizon uses UKAS ISO 15189 partner labs and holds a Trustpilot score of 4.2 from 395 reviews.
This suits someone who, with a GP or on their own initiative, wants to check for a possible dietary magnesium shortfall, for example if diet, alcohol intake or digestive issues put them at higher risk, without needing a fuller mineral panel. On price it is closely matched by Forth's £45 Magnesium Home Blood Test Kit, so it is worth comparing the two if magnesium is the only marker you need; avoid Blue Horizon's own Whole Blood Magnesium test if budget is the priority, since it tests the same mineral for £136.25.
You can collect a sample at home using a finger-prick kit or a Tasso autodraw device, or choose a venous draw at a clinic or a nurse home visit. Results are typically available within around a day and are reviewed by a doctor before you receive them.
A single-marker serum magnesium test, priced at £45.25, close to Forth's £45 equivalent and cheaper than Medichecks' £55 version. It costs far less than Blue Horizon's own Whole Blood Magnesium test at £136.25, and can be done entirely at home with results in around a day.
The listing publishes a detailed 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 1 days, well ahead of the vitamins norm of 3.5.
Results are reviewed by a doctor; the provider does not describe the report format.
Trustpilot 4.2 from 395 reviews; accredited lab (UKAS ISO 15189 partner labs); trading 17+ years.
£45.25 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.
Pricier than two peers, cheaper than whole-blood option
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.
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.
Pricier than two peers, cheaper than whole-blood option
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.
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.
