Can I do a thyroid test at home?
Yes, if you’re over 18. A £32 NHS-lab kit checks 3 hormones, and with symptoms a GP test is free. But 1 in 20 healthy people fall outside the range, so read all 3 together.
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Can I do a thyroid test at home?
Yes. One home kit is tested in an NHS lab in Exeter. It checks three hormones, TSH, FT4 and FT3, for £32 (price checked October 2026).
TSH is the signal from a gland under your brain that tells your thyroid to work. FT4 and FT3 are the hormones your thyroid makes. The lab says these three are nationally recommended for checking your thyroid.
Think you have symptoms? You don’t have to pay. NICE tells GPs to consider a test if a thyroid problem is suspected.
| Option | Cost | What it checks |
|---|---|---|
| GP blood test | Free on the NHS | Often TSH first. More hormones if TSH is outside its range. |
| NHS-lab home thyroid kit | £32 (over 18s only) | TSH, FT4 and FT3. |
| NHS-lab kit with antibodies | £42 | TSH, FT4, FT3 and TPO antibodies. |
| NHS-lab combined screen | £65 | Thyroid, plus diabetes, vitamin D, cholesterol and anaemia. |
Sources: NICE NG145; Monitor My Health
Other private kits exist. Before you buy, check which hormones it tests and that a lab tests your blood.
How does a home thyroid test work?
You prick your finger and fill a small tube. The pack comes with lancets, tubes and a return envelope.
From finger prick to result, in four steps
- 1
Test in the morning
Hormone levels vary in the day. Morning gives the most consistent result.
- 2
Post Monday to Thursday
Use the prepaid envelope. That avoids weekend delays.
- 3
The lab tests it
An NHS lab measures TSH, FT4 and FT3.
- 4
Read your result
Online, with a note on what to do next (no note if you take thyroid medicine).
Sources: Monitor My Health; Monitor My Health FAQs
Massage the side of your hand to get blood flowing. Squeezing your finger is the most common reason a sample fails. If it does, the lab sends a second kit free.
New to this? See how to do a finger-prick test.
Are home thyroid tests accurate?
In small studies, finger-prick TSH came close to a vein test. In 55 people, TSH and FT4 from a finger closely matched the same people’s vein samples.
Delays may matter less than you think. In 46 healthy people, TSH kept in special finger-prick tubes with a preserving liquid still matched a vein test after 5 days.
Dried spots on a card did well too. They picked up 6 of 7 underactive thyroids in clinic patients, but the authors want larger studies first.
None of these tested a UK kit you can buy. So treat a home result as a good guide, and talk to your GP about anything outside the range. More on finger-prick accuracy.
What do my home thyroid results mean?
Your thyroid works like a heating system. TSH is the thermostat.
When the thyroid makes too little, the thermostat turns up, so TSH rises. When it makes too much, the thermostat turns down, so TSH falls.
- Below 0.3 mIU/LBelow this lab’s range.
- 0.3 up to 4.2 mIU/LInside this lab’s range.
- Above 4.2 mIU/LAbove this lab’s range.
Sources: Monitor My Health; BTF
Ranges vary from lab to lab, so always read yours against the range on your own report.
One number just outside isn’t the whole story. The lab’s range fits 95% of healthy people, so 1 in 20 healthy people fall outside it. That’s why the pattern of all three matters.
| Pattern | TSH | FT4 and FT3 |
|---|---|---|
| All three in range | In range | In range. If you’ve never been diagnosed, a thyroid problem is very unlikely. |
| Underactive thyroid | Usually up | Usually down |
| Overactive thyroid | Down | FT4 high |
| Odd mix | Doesn’t fit either | Can come from medicines, recent illness or a rare cause |
Source: Monitor My Health
Got the antibody test? Most people have some TPO antibodies, and high levels can point to the immune system attacking the thyroid.
Positive antibodies also turn up in people without thyroid disease.
Next, check each number in normal thyroid levels and thyroid antibodies. Testing other hormones too? See hormone imbalance blood tests.
When is a home thyroid test the wrong choice?
When you’re pregnant. TSH has a different range in pregnancy, so go through your GP or midwife.
When you’re ill now. NICE says not to test during an acute illness, unless the illness may be caused by your thyroid, as being ill can skew the result.
Already on thyroid medicine? The kit still measures your levels, but its notes can’t advise on your dose. Your GP does that.
See blood tests on levothyroxine. Never stop or change a prescribed medicine without your prescriber.
Before you do a home thyroid test
- Do it in the morning.
- Take thyroid medicine after the test that day, unless your doctor said otherwise.
- Take biotin (vitamin B7)? Leave 24 hours if you take under 10 mg a day, or 72 hours if you take 10 mg or more.
- Wait 3 to 4 weeks after you get over an illness or infection.
- Drink water first. It makes it easier to get blood.
- Note any medicines and supplements to show your GP with the result.
Sources: Monitor My Health; NICE NG145; BTF
Biotin (vitamin B7) matters because high doses can make results read falsely high or low. More in supplements that affect blood tests.
When to speak to a GP
A home kit doesn’t replace your GP. Book an appointment if:
- You think you might have an underactive thyroid, such as feeling very tired, cold, low or gaining weight.
- You have symptoms or signs of an overactive thyroid, such as a racing heart, shaking, or weight loss despite eating more.
- You notice swelling or thickening in your neck, or an irregular or fast heart rate.
- Your home result is outside the range or the pattern looks odd, especially if you have symptoms.
- You have an underactive thyroid and are pregnant or planning to be. Your dose is likely to need to change.
If your symptoms get worse or new ones start, NICE says a repeat test can be considered. But it should be no sooner than 6 weeks after the last one. See also low thyroid symptoms and home tests vs your GP.