When Should a Child Be Tested for Coeliac Disease? How Diagnosis Differs From Adults
Short answer
Children can be tested at any age, though testing under 2 is usually deferred unless there’s a strong clinical reason. The trigger to test is either suggestive symptoms or a known family history. Testing starts with a tTG IgA blood test, just as in adults — but under ESPGHAN guidelines a child can sometimes be diagnosed without a biopsy. Crucially, a child must still be eating gluten regularly for any test to be reliable.
Coeliac disease shows up differently in children than in adults, and the diagnostic route has one paediatric shortcut that adults don’t get. Knowing what to look for — and one thing not to do — makes a correct diagnosis far more likely.
When to test a child
Children can be tested from any age, though testing before 2 years old is generally deferred unless there are strong clinical reasons, because the immune system is still developing. There’s no single “right age” — the trigger should be either suggestive symptoms or a known family history that warrants screening.
Symptoms look different in children
Symptoms in children differ from the adult picture, and they shift with age. Younger children more often present with the classical set: diarrhoea, poor weight gain, failure to thrive, a noticeably distended abdomen, and irritability. In older children the presentation is frequently more atypical — fatigue, anaemia, short stature for their age, dental enamel defects, delayed puberty, or recurrent mouth ulcers, often without obvious gut symptoms at all. That’s exactly why a family history is worth acting on even when a child seems well.
How diagnosis compares to adults
| Age group | Typical presentation | Testing note |
|---|---|---|
| Under 2 | Failure to thrive, diarrhoea, distended tummy, irritability | Testing usually deferred unless there’s a strong clinical reason |
| Young children | Classical gut symptoms; poor growth | tTG IgA first; no-biopsy pathway possible if criteria are met |
| Older children and teens | Atypical: fatigue, anaemia, short stature, delayed puberty, mouth ulcers | Easy to miss; test on family history even without gut symptoms |
The no-biopsy pathway
The diagnostic route starts with a tTG IgA blood test, as in adults. However, ESPGHAN (the European Society for Paediatric Gastroenterology, Hepatology and Nutrition) guidelines, last updated in 2020, allow coeliac disease to be diagnosed in children without a biopsy if three conditions are met: the tTG IgA level is more than 10 times the upper limit of normal, the result is confirmed in a second blood sample, and the child is symptomatic. This “no-biopsy pathway” is now standard practice in many European countries for children who fit the criteria — a paediatric gastroenterologist will confirm whether it applies.
Keep gluten in the diet until testing is done
Here’s the practical point that matters most: children must be eating gluten regularly before testing. If a child has already been put on a gluten-free diet — often by a well-meaning parent who saw symptoms improve — diagnosis becomes much harder, because the blood tests and any biopsy can normalise. If you suspect coeliac disease in a child, get the blood test first. The diet change comes after confirmation.
The bottom line
If you suspect coeliac disease in a child, ask your GP or paediatrician to start with a tTG IgA blood test, and keep gluten in the child’s diet until it’s done — a well-meaning early diet change is the single most common thing that muddies a diagnosis. Symptoms in children are often atypical, so act on a family history even when a child seems fine, and let the results guide what comes next.
Where to go next
- Should the wider family test? Is coeliac disease hereditary?
- Just diagnosed? Start here: What to do first after a child’s diagnosis.
- Do children grow out of it? Do you grow out of coeliac disease?
- Not an allergy: Is coeliac disease a food allergy?
- Back to the full set: Coeliac Children & Family FAQ.
Sources: ESPGHAN guidelines for diagnosing coeliac disease in children (2020); NICE guideline NG20; Coeliac UK (children and testing). General information, not individual medical advice — testing and diagnosis should be arranged through your GP or a paediatric gastroenterologist.
Last verified: 2026-07-20.
Reviewed against the HTGF methodology — every claim sourced, every listing tiered and dated. This article is practical guidance, not medical advice.
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