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PubMed This is a summary of 21 peer-reviewed journal articles Updated
Gastroenterology · Celiac Disease

Should My Relatives Be Screened for Celiac Disease?

At a Glance

First-degree relatives of individuals with celiac disease or dermatitis herpetiformis should be screened with a tTG-IgA blood test, even if they have no symptoms. Relatives must be eating a gluten-containing diet to ensure accurate test results.

In this answer

3 sections

01

Why Screen Asymptomatic Relatives?

02

How Does Screening Work?

03

Next Steps for Your Family

Yes, your first-degree relatives—children, siblings, and parents—should be screened for celiac disease, even if they feel completely fine and have no skin or stomach issues. Dermatitis herpetiformis (DH) is the skin manifestation of celiac disease, and they share the same genetic factors and gluten sensitivity [1][2]. Because of this strong genetic link, first-degree relatives of someone with DH or celiac disease have a significantly increased risk of having or developing the condition themselves, with a prevalence of about 10-11% [3].

Why Screen Asymptomatic Relatives?

Many people with celiac disease do not have obvious symptoms like severe stomach pain or a blistery rash. They might be completely “asymptomatic” or have subtle issues they don’t realize are connected to their diet, such as mild fatigue or weakness, or low iron (anemia) [4][5]. Even without symptoms, untreated celiac disease involves an ongoing immune reaction to gluten that damages the intestines, which is why an intestinal biopsy is often needed to confirm the diagnosis [6]. Diagnosing the condition early allows for treatment with a strict, lifelong gluten-free diet and proper medical follow-up [6].

How Does Screening Work?

Current medical guidelines recommend that first-degree relatives be tested for celiac disease. The screening process typically involves two potential paths:

  • Antibody Blood Tests: The most common and recommended initial screening is a simple blood test looking for specific antibodies, particularly the tissue transglutaminase IgA (tTG-IgA) test [7][8]. This test measures the immune system’s reaction to gluten. It is crucial that relatives are eating a regular, gluten-containing diet when this test is performed, otherwise the results can be falsely negative [9][10]. Doctors also frequently check a “Total IgA” level alongside this test, because IgA deficiency is more common in celiac families and can also cause a false negative on the standard tTG-IgA test [11][12].
  • Genetic Testing (HLA-DQ2/DQ8): Celiac disease and DH only develop in individuals who carry specific genetic markers, known as HLA-DQ2 or HLA-DQ8 [13][14]. Testing for these genes can be very useful for family members. A positive genetic test simply means the relative remains at risk and should have periodic antibody screening in the future—typically every 2 to 3 years, or immediately if any symptoms develop [15][16]. However, not having the genes means they can almost certainly never develop the condition, meaning they likely will not need future antibody screening [17][18].

Testing Children

For children, active screening is vital because many are asymptomatic despite significant intestinal damage [19]. Pediatric screening usually begins around age 2 or 3, once the child has been consistently eating a gluten-containing diet for a significant period [20]. If symptoms appear earlier, testing should be done right away.

What if they develop a rash?

If a relative develops itchy blisters resembling Dermatitis Herpetiformis, a gastroenterologist may not be their first stop. Instead, a dermatologist can perform a skin biopsy looking for specific IgA deposits. This skin biopsy is the “gold standard” for diagnosing DH and the underlying gluten sensitivity, often making an intestinal biopsy unnecessary [2][21].

Next Steps for Your Family

Talk to your children, siblings, and parents about your diagnosis. Explain that because DH and celiac disease run in families, their doctors should be aware of their increased risk.

If you are unsure how to bring it up, here is a short message you can share:

“I was recently diagnosed with Dermatitis Herpetiformis, which is a skin form of celiac disease. Because it has a strong genetic link, my doctor recommended that my first-degree relatives (parents, siblings, and children) get screened with a simple blood test (tTG-IgA and Total IgA), even if you feel totally fine. Please don’t stop eating gluten before the test, as that can cause a false negative.”

Common questions in this guide

Do my family members need to be tested for celiac disease if they have no symptoms?
Yes. First-degree relatives (parents, siblings, and children) have a significantly higher risk of having celiac disease, even if they feel completely fine. Early screening can identify asymptomatic cases and prevent long-term intestinal damage.
Can my family stop eating gluten before their celiac blood test?
No, relatives must be on a regular, gluten-containing diet when the blood test is performed. Removing gluten beforehand can cause the immune system to stop producing antibodies, which leads to a false negative result.
What is the genetic test for celiac disease?
The genetic test looks for specific markers known as HLA-DQ2 or HLA-DQ8. While having these genes does not guarantee someone will develop celiac disease, testing negative means they almost certainly never will.
At what age should children be screened for celiac disease?
Pediatric screening typically begins around age 2 or 3, after the child has been consistently eating a diet containing gluten for a significant period. However, if symptoms appear earlier, testing should be done right away.
What should we do if a family member develops a blistery rash?
If a relative develops itchy blisters resembling dermatitis herpetiformis, they should see a dermatologist. The dermatologist can perform a skin biopsy to look for specific IgA deposits, which is the gold standard for diagnosing the condition.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.At what exact age do you recommend starting screening for my children?
  2. 2.If my relative's initial antibody test is negative but they carry the gene, what exact schedule should we follow for re-testing?
  3. 3.Do you recommend genetic testing (HLA-DQ2/DQ8) for my family members to rule out their risk entirely?
  4. 4.What specific symptoms should my relatives watch out for, even if their blood tests are currently normal?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

Related questions

What Are Dapsone Alternatives for Dermatitis Herpetiformis?What Replaces Dapsone for Dermatitis Herpetiformis?Does Dermatitis Herpetiformis Increase Cancer Risk?Dermatitis Herpetiformis vs Eczema: How to Tell Them ApartIs It Dermatitis Herpetiformis, Eczema, or Scabies?DH Without Stomach Symptoms: Is It Still Celiac Disease?Does Iodine Trigger Dermatitis Herpetiformis Flares?Is Familial Dermatitis Herpetiformis (DH) More Severe?Why Do I Need a G6PD Test Before Starting Dapsone?What Are Granular IgA Deposits in the Papillary Dermis?How Long to Clear Dermatitis Herpetiformis on a GF Diet?How Long for Dermatitis Herpetiformis to Clear on a GFD?Why Does Iodine Trigger Dermatitis Herpetiformis Flares?Negative Celiac Test but Have Dermatitis Herpetiformis?What Autoimmune Diseases Are Linked to DH?Should I Stop Eating Gluten Before a DH Skin Biopsy?Do Creams Work for Dermatitis Herpetiformis Itch?Why is a DH Biopsy Next to the Blister?

References

References (21)
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This information is for educational purposes only and does not replace professional medical advice. Always consult your doctor or gastroenterologist regarding screening and testing for celiac disease.

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