A full thyroid panel including free T3 and antibodies, not just the TSH that standard testing often stops at.
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Thyroid problems are common, straightforward to treat, and easily missed — partly because standard testing frequently measures only TSH, and a TSH inside the reference range is then taken as the end of the conversation.
A full panel gives a considerably clearer picture, particularly where symptoms are convincing but a basic test came back normal. It is the difference between knowing your thyroid stimulating hormone level and knowing what your thyroid is actually doing.
TSH — the signal from the pituitary telling the thyroid to work harder. Counter-intuitively, a high TSH means an underactive thyroid: the brain is shouting because the gland is not responding.
Free T4 — the main hormone the thyroid produces. Read alongside TSH, it distinguishes a thyroid problem from a pituitary one.
Free T3 — the active hormone that actually does the work at cell level. T4 is converted into T3 in the tissues, and that conversion is not equally efficient in everyone. This is one of the markers routine NHS testing usually omits, and it occasionally explains a person who feels unwell on apparently adequate replacement.
Thyroid peroxidase and thyroglobulin antibodies — these establish whether the problem is autoimmune, which is the commonest cause in the UK. Their presence changes the picture considerably: it tells you a borderline result is likely to progress rather than fluctuate, and it means the condition needs monitoring rather than dismissing.
Antibodies are the markers most often left out and the ones that most often change what happens next.
Worth knowing: thyroid symptoms overlap almost exactly with iron deficiency, B12 deficiency and perimenopause. We would usually check those at the same time rather than testing one, waiting, and starting again.
Included: thyroid stimulating hormone (TSH) · free thyroxine (FT4) · free tri-iodothyronine (FT3) · anti-thyroglobulin antibody · anti-thyroid peroxidase antibody.
Free T3 and both antibodies are the markers routine testing usually omits, and they are often what explains a convincing set of symptoms alongside a normal TSH.
1. Consultation. We take a full history — which matters, because thyroid results are interpreted against symptoms rather than in isolation.
2. Referral. To a Randox Health clinic at a time and location that suits you.
3. The sample. A single blood draw, no fasting. If you take levothyroxine, give the sample before that day's dose. Taking it first falsely elevates the reading. Stop biotin supplements 48 hours beforehand — biotin, common in hair and nail supplements, distorts thyroid assays and produces misleading results.
4. Results review. A GP goes through the whole panel with you, including what a borderline TSH with positive antibodies actually means for you — which is usually more useful than the result itself.
No fasting required. If you take levothyroxine, take the sample before your dose that day. Biotin supplements can distort results and should be stopped 48 hours beforehand.
A high TSH means an underactive thyroid. The pituitary is shouting because the gland is not responding. A low TSH usually means an overactive one.
People frequently read it the other way round, and it is worth getting straight before looking at your own numbers.
Positive thyroid antibodies mean the cause is autoimmune — Hashimoto's — and that a borderline result is likely to progress rather than fluctuate.
Two people with an identical TSH of 5.5 are in quite different situations depending on whether their antibodies are positive. On a TSH-only test they look the same, which is precisely why antibodies are worth measuring.
A reference range describes where 95% of a population falls. It is not a target.
Most people on treatment feel best with a TSH in the lower half of the range, and titration is frequently abandoned the moment a result lands anywhere inside it. If your result is at the top of the range and you feel unwell, that is a conversation rather than a closed question.
Acute illness also disturbs thyroid results temporarily. Testing in the middle of a significant illness produces a picture that means little.
Thyroid function fluctuates. A single borderline result taken during or shortly after an illness may not represent your baseline, and repeating it after six to eight weeks is often more informative than acting on it immediately.
A slightly raised TSH with a normal T4 and negative antibodies frequently does not need treating, and starting lifelong replacement on that basis is a decision worth resisting.
Equally, if your numbers are good and you still feel unwell, more levothyroxine is not the answer — over-replacement causes atrial fibrillation and reduced bone density over years, and the explanation is usually somewhere else.
Thyroid testing is free on the NHS, and if you have symptoms your GP can request it. What is frequently missing from NHS testing is the antibodies and free T3, and it is entirely reasonable to ask for those to be added.
And if you are diagnosed with an underactive thyroid needing levothyroxine, you qualify for a medical exemption certificate in England — which makes all your NHS prescriptions free, not just the thyroid ones. Many people entitled to one never apply.
Repeat panels every few weeks. TSH takes six to eight weeks to settle after a dose change — testing sooner produces a figure nobody can act on, and any service selling frequent monitoring panels is selling tests rather than providing care.
"Thyroid support" supplements and iodine. Iodine deficiency is uncommon in the UK, and excess iodine can worsen thyroid disease.
Testing TSH alone and stopping there is cheaper on the day and frequently costs months. If the question is why you feel unwell, the antibodies and the mimics — ferritin, B12, vitamin D — are what make the test worth doing.
It makes a thyroid problem less likely, but it is not the whole picture. A normal TSH with positive antibodies means an autoimmune process is under way and likely to progress — and a TSH-only test cannot show you that.
It also does not tell you your free T4 or T3, which occasionally explain someone who feels unwell on apparently adequate replacement.
Because they change what a borderline result means. Positive antibodies identify Hashimoto's, predict progression, and turn "watch and see" into "monitor properly".
They are the marker most often left out and the one that most often changes what happens next.
No. But if you take levothyroxine, give the sample before that day's dose — taking it first falsely elevates the reading.
And stop biotin supplements 48 hours beforehand. Biotin is in most hair and nail supplements and it genuinely distorts thyroid assays.
Morning is preferable. TSH follows a daily rhythm and is highest in the early hours, falling through the day — so an afternoon sample can read lower than the same person's morning value.
It rarely changes the diagnosis, but it matters when a result sits near a threshold.
Not always — and being told the honest answer is more useful than being treated by default.
Treatment is generally warranted with a TSH above 10, with positive antibodies, with symptoms, or in pregnancy. Otherwise monitoring is often the better answer.
Then the answer is somewhere else, and it is worth looking rather than repeating the same test.
Iron deficiency, B12 deficiency, vitamin D deficiency, sleep apnoea, perimenopause, coeliac disease and depression all produce exactly this picture — which is why we would usually test them together rather than one at a time.
Not routinely if you are well. Testing for the sake of it produces borderline results that generate anxiety and repeat tests.
Annually is appropriate if you are on treatment or have positive antibodies, and sooner if something changes.
No, and it is worth being clear about. Thyroid blood tests are frequently entirely normal in thyroid cancer.
A neck lump needs examination and an ultrasound, not a blood test — and a normal panel is not reassurance about a lump.
Tell us, because the interpretation changes. Thresholds for treatment are lower in pregnancy, and if you are already on levothyroxine, requirements rise by around 25–50% in early pregnancy and the dose needs increasing promptly.
Never stop levothyroxine in pregnancy.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
August 23, 2026
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