Checks the three core thyroid markers, TSH, free T4 and free T3, used to help assess an underactive or overactive thyroid. Suited to anyone with possible thyroid symptoms who wants more than a single TSH reading.
3 biomarkers as listed by Selph.
The Thyroid Blood Test measures thyroid stimulating hormone (TSH), free thyroxine (FT4) and free triiodothyronine (FT3), the three hormones most commonly used together to assess whether your thyroid is underactive or overactive. Checking all three, rather than TSH alone, gives a fuller picture of thyroid function, since TSH can sometimes look normal while FT4 or FT3 are already out of range.
Among the eight thyroid tests in this comparison group, Selph's three markers put it at the top for clinical depth, matched only by Monitor My Health (£32), Medichecks (£45) and Better2Know's Full Thyroid Profile (£199); most other listings check just two markers. On price, £55 sits almost exactly at the £54.90 median, though Monitor My Health offers the same three-marker combination for substantially less.
Clinical depth scores highly as a result of matching the fullest marker count in this group, and collection convenience and trust signals both score well thanks to multiple collection routes and a doctor-reviewed report within two days. The value for money score is middling, reflecting a price at the group's typical level rather than below it.
This suits anyone with possible thyroid symptoms, such as unexplained weight change, fatigue or mood changes, who wants TSH, FT4 and FT3 checked together rather than TSH alone. If price is your main concern, Monitor My Health tests the same three markers for £32, notably less than Selph's £55.
You collect a finger-prick blood sample at home using the included kit, or choose Tasso EasyDraw, a clinic visit, a home nurse visit or your own venous draw at extra cost, ideally sampling in the morning before breakfast. Once your sample reaches Selph's lab, results are typically ready in one to two days and are reviewed by a Selph doctor before you receive your report.
This £55 test checks TSH, free T4 and free T3, the three core thyroid markers, rather than the single or two-marker versions some rivals offer. It's priced almost exactly at the £54.90 median for the eight thyroid tests we compare, though Monitor My Health offers the same three markers for £32. Results are reviewed by a doctor within one to two days.
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.
3 biomarkers against a median of 2 across the 9 tests in its 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 2 days, in line with or faster than similar tests.
Results are reviewed by a doctor; the provider does not describe the report format.
Trustpilot 4.9 from 71,592 reviews; accredited lab (UKAS ISO 15189 partner labs (Inuvi, TDL)); CQC registered; doctor review as standard.
£55.00 against a comparison-group median of £54.90 (+0%).
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 Thyroid function (TSH, FT4, FT3) comparison group. See how it stacks up against equivalent tests from other providers.
Cheapest full 3-hormone thyroid panel
A three-hormone blood test measuring TSH, FT4 and FT3, the standard panel used to check for an underactive or overactive thyroid.
Three-hormone thyroid panel priced like a two-hormone test
Checks TSH, free thyroxine and free T3, the three core hormones used to assess thyroid function. Suited to people investigating symptoms like fatigue or weight change, or monitoring a known thyroid condition.
Same two markers as rivals, but not the cheapest
A basic thyroid check covering TSH and FT4, the two hormones most commonly used as a first screen for an underactive or overactive thyroid. It suits anyone wanting a quick initial check.
TSH/FT4 test beaten on price only by Monitor My Health
An at-home finger-prick test measuring TSH and FT4, two markers commonly used to check thyroid function. Suited to people with symptoms such as fatigue, weight changes or mood changes.
Matches Medichecks on price but tests one fewer marker
Measures TSH and free T4, the two core thyroid hormones, to help indicate an underactive or overactive thyroid. Suits anyone with symptoms like fatigue, weight change or mood changes who wants an initial thyroid check.
Priciest 2-marker thyroid kit in its group
An at-home finger-prick test checking FT4 and TSH, the two core thyroid hormones, for people who want a thyroid function check without a clinic visit.
Same three markers as rivals, priced far above them
Checks the three core thyroid hormones, TSH, FT4 and FT3, from a home finger-prick blood sample. Suits anyone wanting a full first-line thyroid check rather than TSH alone.
Pricier than most 2-marker thyroid tests, no FT3 included
A blood test measuring TSH and FT4, the two hormones commonly used to assess thyroid function. Suited to anyone monitoring a known thyroid issue or investigating symptoms such as fatigue with a GP.
Cheapest full 3-hormone thyroid panel
A three-hormone blood test measuring TSH, FT4 and FT3, the standard panel used to check for an underactive or overactive thyroid.
Three-hormone thyroid panel priced like a two-hormone test
Checks TSH, free thyroxine and free T3, the three core hormones used to assess thyroid function. Suited to people investigating symptoms like fatigue or weight change, or monitoring a known thyroid condition.
Same two markers as rivals, but not the cheapest
A basic thyroid check covering TSH and FT4, the two hormones most commonly used as a first screen for an underactive or overactive thyroid. It suits anyone wanting a quick initial check.
TSH/FT4 test beaten on price only by Monitor My Health
An at-home finger-prick test measuring TSH and FT4, two markers commonly used to check thyroid function. Suited to people with symptoms such as fatigue, weight changes or mood changes.
