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Private Coeliac Antibody Blood Test UK (2026): Cost, Markers and How to Read Your Result
Critical: you must be eating gluten
Per NICE NG20, you need to be eating gluten in more than one meal per day for at least six weeks before this test. If you've already cut gluten out, the test will probably come back negative even if you have coeliac disease. Do not test on a gluten-free diet and assume the result is meaningful. Either start a gluten challenge first, or talk to your GP.
Information, not medical advice
Coeliac disease is a lifelong autoimmune condition with serious complications if untreated. If you have a positive result on a private test, see your GP. Full disclaimer.
Want the buyer’s view rather than the marker-by-marker science? Our private coeliac blood test UK buyer guide covers costs, NHS pathway from positive blood test to biopsy, HLA-DQ2/DQ8 gene testing for the already-gluten-free scenario, and what to do about NCGS. The private blood tests UK pillar covers broader market context.
The 90-second answer
If you only read one box
- The first-line UK test is tTG-IgA (tissue transglutaminase, IgA class) measured alongside total IgA. This is what NICE NG20 specifies and what the NHS uses.
- You must be eating gluten for the test to be valid — at least one meal per day, ideally more, for at least 6 weeks beforehand. NICE specifically warns against testing on a gluten-free diet.
- UK price: £39–£99 for a private finger-prick or venous panel. Free on the NHS if your GP agrees there's clinical suspicion.
- Positive result is not a diagnosis. It's a signal to see a gastroenterologist. Most adults still need duodenal biopsy to confirm. Don't start a gluten-free diet between a positive antibody test and the biopsy — it makes the biopsy less reliable.
Coeliac disease affects about 1 in 100 UK adults, but the majority of cases are undiagnosed. Symptoms are broad and non-specific — chronic tiredness, iron-deficiency anaemia, IBS-like gut symptoms, mouth ulcers, infertility, brain fog — which is why so many people end up asking, late and exasperated, "could this be coeliac?". A private coeliac antibody test is a reasonable way to find out without waiting weeks for an NHS GP appointment, provided you're still eating gluten and you understand what the result actually means.
What the test actually measures
Coeliac disease is an autoimmune reaction to gluten. When a coeliac patient eats gluten, their immune system makes antibodies against an enzyme in the gut wall called tissue transglutaminase. Blood tests look for those antibodies. The standard UK markers:
- tTG-IgA (tissue transglutaminase, IgA class) — the first-line antibody. Highly sensitive and highly specific for coeliac disease in patients eating gluten. The single most important number on the report.
- Total IgA — measured at the same time because about 2% of coeliac patients are IgA-deficient. If total IgA is low, tTG-IgA will be falsely negative — you'd need IgG-class testing instead.
- EMA (endomysial antibody, IgA class) — a more specific (but less sensitive) confirmatory antibody. Used by some labs as a follow-up if tTG-IgA is positive or borderline.
- DGP-IgG (deamidated gliadin peptide, IgG class) — used in IgA-deficient patients or younger children. Not routinely tested in adults with normal IgA.
- tTG-IgG — used in IgA-deficient patients as a backup to tTG-IgA.
A reputable UK private coeliac panel measures at minimum tTG-IgA and total IgA. If the provider only sells tTG-IgA on its own, you should treat a negative result with caution — you can't tell whether IgA deficiency is masking the result.
UK providers and 2026 pricing
Prices verified 17 May 2026
Provider pricing carried forward from product pages on 17 May 2026. Bundle and subscription discounts may apply. We re-verify weekly. Treat as ballpark, not as a quote.
- Medichecks Coeliac Test — finger-prick, tTG-IgA + total IgA, UKAS ISO 15189 lab. From around £39. Doctor's comment included on most tiers.
- Thriva Coeliac add-on — included on selected comprehensive panels. Subscription model; not always available as a standalone.
- Forth With Life coeliac panel — included in Edge Complete and Edge Ultimate tiers as part of broader screening. Standalone availability varies.
- Randox Health — coeliac antibodies included in selected clinic packages and Everyman/Everywoman flagship panels. Venous draw at a Randox clinic.
- LetsGetChecked UK — coeliac testing has been discontinued as part of LGC's 2026 catalogue narrowing. See our LGC catalogue analysis.
Comprehensive bundles often work out cheaper per marker if you also want vitamin D, B12, folate, thyroid and ferritin alongside coeliac — which is sensible because untreated coeliac causes deficiencies in exactly those markers. See our tiredness guide for the cheap-first marker stack and which provider does each panel best.
Why you must be eating gluten
The antibodies the test looks for are only produced when the immune system is reacting to gluten. If you've been gluten-free for weeks or months, those antibodies fall — sometimes to undetectable levels. A negative result on a gluten-free diet doesn't mean you don't have coeliac disease. It just means you don't have active antibody production right now.
NICE NG20 is explicit: testing should be done on a gluten-containing diet of more than one meal per day for at least six weeks before the test. If you've been gluten-free and want a definitive answer, the standard approach is a "gluten challenge" — typically 10g of gluten per day (roughly four slices of wheat bread or equivalent) for 6 weeks before testing. This isn't pleasant if symptoms return, but it's the only way to get a meaningful antibody result.
An alternative if you can't tolerate a gluten challenge is HLA-DQ2/DQ8 genetic testing. About 99% of coeliac patients have one of these gene variants, so a negative HLA test makes coeliac very unlikely. A positive HLA result doesn't confirm coeliac — about 30% of the general UK population carries DQ2 or DQ8 without ever developing the disease — but it's useful as a rule-out. HLA testing isn't affected by diet. Medichecks and other UK providers offer it as a standalone test for around £79–£129.
How to read your result
tTG-IgA negative, total IgA normal
Coeliac disease is very unlikely if you've been eating gluten properly for the 6 weeks prior to the test. This is the reassuring scenario. If you have ongoing gut symptoms, consider non-coeliac gluten sensitivity, IBS, lactose intolerance, or other causes — your GP can investigate.
tTG-IgA negative, total IgA low
The test is uninterpretable. You need IgG-class antibody testing (tTG-IgG or DGP-IgG). A reputable private provider will flag this on the report and recommend a retest. Bring the result to your GP.
tTG-IgA borderline (slightly raised)
Coeliac is possible but not confirmed. Most UK gastroenterologists will want either a confirmatory EMA test or proceed straight to duodenal biopsy. See your GP and ask for referral. Continue eating gluten until the biopsy — going gluten-free between an antibody test and a biopsy is the most common reason for a falsely-negative biopsy. A borderline result is also where lab-to-lab variation matters most — see UK blood test reference ranges explained for why two labs can flag the same sample differently.
tTG-IgA strongly positive (10× upper limit of normal)
Highly suggestive of coeliac disease. Standard UK pathway is gastroenterology referral and duodenal biopsy. NICE NG20 supports a "no biopsy" diagnosis in some adults when tTG-IgA is 10× the upper limit of normal AND EMA is positive AND HLA-DQ2/DQ8 is positive — but this is a clinical decision made by a gastroenterologist, not by you on the basis of a private antibody result.
Do not start a gluten-free diet on a strongly positive result without seeing a clinician. It makes biopsy confirmation harder, and a few months of continued gluten won't change the ultimate diagnosis or outcome.
The NHS pathway (free, with a wait)
NICE NG20 specifies who should be offered NHS coeliac testing:
- Persistent unexplained gastrointestinal symptoms
- Faltering growth or chronic diarrhoea
- Prolonged fatigue
- Unexpected weight loss
- Severe or persistent mouth ulcers
- Unexplained iron, vitamin B12 or folate deficiency
- Type 1 diabetes (at diagnosis)
- Autoimmune thyroid disease (at diagnosis)
- IBS (consider testing in adults)
- First-degree relatives of confirmed coeliac patients
If you fit any of these, your GP should test you for free. The blood test itself is straightforward; the wait is usually for the appointment, not the result.
When private coeliac testing is genuinely useful
- You don't fit the NICE criteria but want to rule it out. Your GP isn't obliged to test "just in case." A £39 private tTG-IgA can give you an answer this week.
- You're about to consider a gluten-free diet. Test before, not after. A negative private result means you can experiment with diet without ever needing a future gluten challenge. A positive result tells you to see a GP, not to start the diet yourself.
- You're tired and your GP has run TSH only. Add coeliac to a comprehensive tiredness panel (ferritin, vitamin D, B12, folate, full thyroid, HbA1c) — about £79–£99 for the lot.
- You have a first-degree relative with coeliac. Risk is roughly 1 in 10. Worth knowing.
Related test pages
- Private ferritin & iron blood test UK
- Private vitamin D blood test UK
- Private vitamin B12 & folate blood test UK
- Private full blood count (FBC) test UK
- Private thyroid blood test UK
Related guides
- Blood test for tiredness UK — the cheap-first stack
- Best women's health blood test UK
- Best men's health blood test UK
- Private vs NHS — when is paying worth it?
- How to read your private result
FAQ
Can I do a coeliac test if I've already gone gluten-free?
No — you'll likely get a negative result even if you have coeliac. You need to be eating gluten in more than one meal per day for at least six weeks before testing.
What does tTG-IgA actually mean?
Tissue transglutaminase IgA is the first-line antibody. A raised result in someone eating gluten is highly suggestive of coeliac and warrants referral.
Why is total IgA tested too?
About 2% of coeliac patients are IgA-deficient, which makes tTG-IgA falsely negative. Testing total IgA tells you whether the result can be trusted.
Is a positive private coeliac test a diagnosis?
No. It's a signal to see a gastroenterologist. Most adults still need duodenal biopsy to confirm. NICE NG20 supports a "no-biopsy" pathway in selected adults with very high antibody titres, but that's a clinical decision, not yours.
How much does a private coeliac test cost?
£39–£99 in the UK in 2026, depending on whether you want tTG-IgA + total IgA alone or a fuller panel including EMA.
Will the NHS test for free?
Yes, if your GP agrees there's clinical suspicion per NICE NG20.