A single blood test measuring Free T4, often used alongside TSH for a basic check of thyroid function. It suits people who want to add this specific marker to their thyroid picture rather than run a full panel.
1 biomarker as listed by Blue Horizon Medicals.
Free T4, or free thyroxine, is released from the thyroid gland and its role is to help control metabolism, the release of energy from cells throughout the body. According to the provider, Free T4 is generally seen as a reliable indicator of whether the thyroid is over-active or under-active, and is often used alongside TSH for a basic assessment of thyroid function.
Blue Horizon Medicals does not list group peers for this specific single-marker Free T4 test, but against the 16 similarly sized thyroid tests we track more broadly, its price of £45.25 is about 12% below the £51.63 median, making it one of the more competitively priced single thyroid markers in that wider set. As with the provider's other single-marker tests, a single biomarker naturally scores lower for depth than a multi-marker panel would. Collection is flexible, with finger-prick at home, the Tasso autodraw device, a clinic visit or a nurse home visit all available, and results back within one working day.
The listing gives a detailed description of what Free T4 measures and why it matters, backed by stated collection options and a clear turnaround, which supports a strong clarity score. Trust signals reflect Blue Horizon Medicals' Trustpilot score of 4.2 from 395 reviews, UKAS ISO 15189 partner labs, and a trading history back to 2009. Results are reviewed by a doctor, though this is something you add at checkout rather than get by default.
This suits you if you specifically want a Free T4 reading, for example to add to a previous TSH result, rather than needing a full thyroid workup. Because it measures only one marker, it is less useful as a first thyroid check on its own than a combined TSH and Free T4 test would be.
If you are investigating thyroid symptoms for the first time and haven't had TSH tested, it's worth checking whether a combined panel would serve you better, or speaking to your GP about which markers are appropriate.
You can provide a sample by finger-prick at home, using the Tasso autodraw device, by venous draw at a clinic, or through a nurse home visit, selecting your preferred option at checkout. Once the sample reaches the lab, Free T4 is measured and the results are reviewed by a doctor, with a turnaround of one working day.
This is a single-marker test for Free T4, commonly used alongside TSH for a basic check of thyroid function. At £45.25 it costs less than the £51.63 median for the 16 similarly sized thyroid tests we track, a saving of around 12%. As a single marker it gives you one part of the thyroid picture, so pairing it with TSH is more informative than testing Free T4 alone.
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.
1 biomarkers, placing it in the 10th percentile of thyroid tests we track.
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 thyroid norm of 2.
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 median of £51.63 for the 16 similarly sized thyroid tests we track (-12%).
Calculated 13 September 2026 from the facts we hold about this test and provider, using our published scoring formula. Scores are not hand-edited.
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