Coeliac Disease Blood Tests: What Results Mean
Bloating, diarrhoea, stomach pain and tiredness can have plenty of causes. Coeliac disease is one possibility, particularly if symptoms keep returning or you also have unexplained iron deficiency, weight loss or mouth ulcers. A blood test is usually the first step when coeliac disease is suspected.
Coeliac disease is an autoimmune condition. Gluten, a protein found in wheat, barley and rye, triggers the immune system to damage the lining of the small intestine. That damage can affect how well the body absorbs nutrients. It is different from a food intolerance, and it is not the same as a wheat allergy.
What does a coeliac blood test check?
The usual first-line screen checks for antibodies linked to coeliac disease. The main marker is tissue transglutaminase immunoglobulin A, usually written as tTG-IgA. Total immunoglobulin A, or total IgA, is checked at the same time because an IgA deficiency can make a tTG-IgA result look negative when coeliac disease is still possible.
A private screening test can show whether these antibodies are raised and whether further investigation is sensible. It does not, by itself, confirm a final diagnosis. If antibodies are found, the NHS says a GP may refer you to a gastroenterologist, who might arrange further blood tests or an intestinal biopsy.
The result needs to be considered alongside your symptoms and medical history. A blood test is useful evidence, not a complete answer.
Do not stop eating gluten before testing
This is the detail people most often miss. You need to keep eating gluten while you are being tested. Removing bread, pasta and other gluten-containing foods can lower antibody levels and produce an inaccurate result.
NHS guidance says you should include gluten in your diet before the blood test. Coeliac UK refers to guidance recommending gluten in more than one meal each day for at least six weeks before testing. Medichecks gives the same preparation advice for its private coeliac test.
If you have already started a gluten-free diet, speak to your GP or a qualified clinician before arranging a test. Do not deliberately eat gluten if you have previously had a serious allergic reaction to wheat or another food. That needs medical advice rather than a DIY testing plan.
What do positive and negative results mean?
A positive antibody result makes coeliac disease more likely, but it is not the same as a diagnosis. A specialist may need to carry out further tests while you are still eating gluten. Starting a gluten-free diet too early can make those follow-up tests less reliable.
A negative result makes coeliac disease less likely when you have been eating enough gluten and your total IgA is normal. It does not rule it out in every case. Some people have IgA deficiency, and some people with ongoing symptoms need additional assessment even after a negative screen.
Ask a GP for advice if you have persistent symptoms, unexplained anaemia or nutrient deficiencies, or a close relative with coeliac disease. The NHS notes that further blood tests may be used to look for iron and other vitamin or mineral deficiencies caused by poor absorption.
How much does a private coeliac blood test cost?
Private prices vary depending on whether the test is a single coeliac screen, part of a wider panel, or taken at a clinic. Our comparison data includes these current options:
| Provider | Test | Price | Link |
|---|---|---|---|
| Bluecrest Wellness | Coeliac Disease | £65 | View test |
| Goodbody Clinic | Coeliac Screen Blood Test | £179 | View test |
The Bluecrest listing is a clinic-based price page, while Goodbody lists a named coeliac screening product. Check what sample collection, clinician review and follow-up support are included before comparing prices. A cheap test is not necessarily the best fit if you need an appointment or help understanding the result.
You can compare coeliac blood tests by price, or search for related iron tests if anaemia is part of the picture.
Private test or NHS GP appointment?
The NHS route is usually the sensible starting point if you have symptoms or risk factors. Your GP can assess the wider picture, arrange the correct tests and refer you if needed. You may also avoid paying for a test that is not appropriate for your symptoms.
A private test can be useful if you want to arrange screening quickly, cannot get a GP appointment soon, or want to check a specific marker. It should not replace medical care. Choose a provider that explains the markers, gives a report you can understand and tells you what to do if the result is abnormal.
Do not treat a negative home or private result as permission to ignore persistent symptoms. False negatives can happen, especially if you were not eating gluten or have IgA deficiency.
What to do after the result
If your result is positive, keep eating gluten unless a clinician tells you otherwise and arrange follow-up with your GP or the testing provider. You may need specialist confirmation before changing your diet.
If the result is negative but your symptoms continue, take the report to your GP. Ask whether your total IgA was checked and whether other causes, such as iron deficiency, thyroid disease or inflammatory bowel conditions, should be considered.
Do not start iron or high-dose vitamin supplements just because you feel tired. A clinician can check whether you need them and look for the reason behind a deficiency. Seek urgent help for severe abdominal pain, repeated vomiting, black or bloody stools, or signs of dehydration.
Header image from Pexels
This article is for general information and does not replace advice from a GP or other qualified healthcare professional.
Prices and availability can change. Check the provider’s website before booking.