Is Coeliac Disease Hereditary? Should My Family Members Get Tested?
Short answer
Yes — coeliac disease is strongly hereditary. First-degree relatives (parents, siblings and children) carry roughly a 10% lifetime risk, against about 1% in the general population, and should be offered a tTG IgA blood test regardless of symptoms. The condition is linked to the HLA-DQ2 and HLA-DQ8 genes, which are necessary but not sufficient. Because many relatives who test positive have few or no symptoms, screening matters even when everyone feels well.
A coeliac diagnosis in one person is a genuine reason for the rest of the immediate family to get checked. The genetics are well established, and the practical steps are straightforward once you know who is at higher risk.
How strong is the genetic link?
The risk is significant: first-degree relatives have approximately a 10% lifetime chance of developing coeliac disease, compared with around 1% in the general population. The condition is strongly associated with two HLA gene variants — HLA-DQ2 and HLA-DQ8 — which are necessary but not sufficient for it to develop. Around 40% of the general population carries one of these variants, yet only a small proportion go on to develop coeliac disease, which tells us that additional environmental and immune factors are also involved.
Why test relatives who feel fine?
What makes family screening so important is the high rate of silent or atypical coeliac disease. Research on screened first-degree relatives has found that most of those who test positive have either no symptoms at all, or symptoms they hadn’t connected to coeliac disease — meaning they would never have thought to ask for a test. Screening on the basis of family history, rather than waiting for symptoms, is what catches these cases.
Who should be tested, and what to do
| Relative | Approx lifetime risk | What’s recommended |
|---|---|---|
| Parent, sibling or child (first-degree) | ~10% | Offered a tTG IgA blood test, symptoms or not |
| Second-degree (grandparent, aunt, uncle, niece, nephew) | Above average, below first-degree | Test if symptoms suggest it; mention the family history to their GP |
| General population | ~1% | Test if symptoms or related conditions appear |
| Anyone who tested negative before | Risk continues over time | Re-test if symptoms develop; some clinicians re-check periodically |
A negative test isn’t forever
Recommendations vary slightly by country, but the broad rule is consistent: all first-degree relatives of a confirmed coeliac should have a tTG IgA blood test, whatever their symptoms, and a positive result warrants further investigation. Just as importantly, a negative result at one point doesn’t guarantee lifelong freedom — the disease can develop at any age in genetically susceptible people, so some clinicians suggest re-testing every few years or whenever new symptoms appear.
The bottom line
Coeliac disease runs in families. Every first-degree relative should be offered a tTG IgA blood test, even if they feel completely well, because silent cases are common. Talk to your GP or gastroenterologist about arranging testing for your immediate family, and make sure relatives in other households know about the diagnosis so they can raise it with their own doctors.
Where to go next
- Not an allergy — here’s the difference: Is coeliac disease a food allergy?
- Can you grow out of it? Do you grow out of coeliac disease?
- Testing a child specifically: When should a child be tested?
- Just diagnosed in the family: What to do first after a child’s diagnosis.
- Back to the full set: Coeliac Children & Family FAQ.
Sources: Coeliac UK (family risk and testing); NICE guideline NG20 (who to test); ESPGHAN guidance on first-degree relatives. General information, not individual medical advice — ask your GP or gastroenterologist about testing for your family.
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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