If bread, pasta or beer leave you bloated, foggy or running to the loo, testing is worth doing — but there's one mistake that ruins it for thousands of people every year: going gluten-free before being tested. This guide explains the three distinct gluten-related conditions, the tests that identify each, and why the order of testing matters. The Vesey in Sutton Coldfield offers coeliac screening from £32 with results in 24–48 hours, no referral needed.
The Golden Rule: Test Before You Quit Gluten
The main gluten test — coeliac serology — detects antibodies your immune system makes while you are eating gluten. Stop eating gluten and the antibodies fall, so the test can come back falsely normal within weeks.
UK guidance is to eat gluten in more than one meal a day for at least 6 weeks before testing. If you've already gone gluten-free and feel better, you face an awkward choice: a 6-week 'gluten challenge' before testing, or never knowing whether you have coeliac disease — which changes everything from how strict you need to be to whether your family should be screened.
Coeliac Disease: The Test That Matters Most
Coeliac disease is an autoimmune condition where gluten triggers damage to the small bowel lining. It affects about 1 in 100 people in the UK — and around 70% are undiagnosed. Symptoms go far beyond gut upset: unexplained anaemia or low ferritin, fatigue, mouth ulcers, weight loss, infertility, an itchy blistering rash (dermatitis herpetiformis), and osteoporosis at a young age.
Testing starts with a tTG-IgA blood test (with total IgA, to catch the people whose IgA deficiency would otherwise mask the result). A positive result is followed by gastroscopy with biopsy to confirm. First-degree relatives of anyone with coeliac disease should be tested too — their risk is about 1 in 10.
Untreated coeliac disease matters even when symptoms are mild, because ongoing bowel damage drives anaemia, bone thinning and other complications. A strict lifelong gluten-free diet reverses the damage — but that commitment deserves a confirmed diagnosis first.
Wheat Allergy and Non-Coeliac Gluten Sensitivity
Wheat allergy — a true IgE allergy causing rapid-onset symptoms (hives, swelling, wheeze) after wheat. Testable with specific IgE bloods or skin-prick testing where the history fits. Uncommon in adults.
Non-coeliac gluten sensitivity (NCGS) — real symptoms triggered by wheat or gluten with negative coeliac and allergy tests. There is no lab test for NCGS: it's diagnosed by excluding coeliac disease and wheat allergy first, then a structured exclusion and blinded-style reintroduction. Interestingly, research suggests many people with NCGS are actually reacting to fructans (a FODMAP in wheat) rather than gluten itself — which broadens what you can safely eat.
As with all intolerances, skip IgG 'gluten sensitivity' panels and hair tests — they cannot diagnose any of these conditions.
Getting Tested at The Vesey
Coeliac serology at The Vesey costs from £32 as an individual test, with results in 24–48 hours — often bundled with ferritin, B12, folate and vitamin D, since coeliac disease commonly causes deficiencies. A GP consultation (from £90) covers the history, arranges the right tests in the right order, and refers to gastroenterology on site if biopsy confirmation is needed.
If tests are negative, our dietitians run structured wheat/FODMAP exclusion programmes to pin down what's actually driving your symptoms. Book online or call 0121 387 3727 — open 7 days, 8am–8pm.
Bloated after bread? Screen for coeliac before you cut gluten
CQC-regulated · Rated 4.87/5 on Doctify · Open 7 days 8am–8pm · No referral needed
Frequently Asked Questions
Can I test for gluten intolerance if I'm already gluten-free?
Not reliably. Coeliac antibodies disappear on a gluten-free diet, so you would need to eat gluten in more than one meal daily for at least 6 weeks before the blood test. If you cannot face a gluten challenge, discuss the options with a GP — HLA gene testing can sometimes help rule coeliac disease out.
What blood test checks for coeliac disease?
Tissue transglutaminase IgA (tTG-IgA) with a total IgA level is the standard first-line screen. Positive results are confirmed by gastroscopy with small-bowel biopsy. At The Vesey the blood test costs from £32 with results in 24–48 hours.
Is gluten sensitivity real if my coeliac test is negative?
Yes — non-coeliac gluten sensitivity causes genuine symptoms with normal coeliac and allergy tests. It is diagnosed by structured exclusion and reintroduction after ruling out coeliac disease. Many people with NCGS turn out to be reacting to fructans in wheat rather than gluten, which a dietitian can help untangle.
Should my family be tested if I have coeliac disease?
Yes. First-degree relatives (parents, siblings, children) have roughly a 1 in 10 chance of coeliac disease, often with minimal symptoms, and UK guidance recommends offering them testing. The Vesey can screen family members with the same-day blood draw, no referral needed.