When to Screen Down Syndrome Patients for Celiac?

Children with Down syndrome are at a significantly higher risk for developing celiac disease compared to the general population, with incidence rates estimated to be more than 18 times higher ^[1]. While older guidelines suggested testing every child with Down syndrome, the American Academy of Pediatrics (AAP) updated their guidelines in 2022 and now recommends targeted screening only when symptoms are present, rather than universal screening for children without any symptoms ^[2]. Because of the high risk, however, it is essential for parents to be aware that symptoms of celiac disease in children with Down syndrome are often subtle or “non-classic,” meaning you must watch closely for signs beyond just typical stomach upset ^[3][4].

Why Monitoring for Subtle Symptoms is Critical

Celiac disease is an autoimmune condition where the body mistakenly attacks the lining of the small intestine when gluten (a protein found in wheat, barley, and rye) is consumed. Left untreated, it can lead to significant health complications due to delayed diagnosis, such as poor growth, nutritional deficiencies, and anemia.

Because screening is now driven by symptoms rather than a set age schedule, it is crucial not to wait for classic signs like chronic diarrhea. In children with Down syndrome, the condition often presents with less obvious signs ^[5][6]. Relying only on obvious stomach issues for diagnosis is unreliable and frequently causes diagnostic delays ^[7][8].

Subtle Signs to Watch For:

• Unexplained anemia (low iron levels)
• Persistent or worsening constipation
• Changes in behavior or unusual irritability
• Faltering growth or slow weight gain
• Chronic fatigue

If you notice any of these signs in your child, even if they seem minor, you should discuss celiac screening with your pediatrician.

How the Screening Works

Screening for celiac disease involves a simple blood test. It is critical that your child is regularly eating foods that contain gluten (such as regular pasta, bread, or crackers) for several weeks before the test; otherwise, the results may not be accurate.

• The tTG-IgA Test: The primary screening tool is a blood test that measures anti-tissue transglutaminase (tTG) IgA antibodies ^[9][10]. High levels of these antibodies strongly suggest the presence of celiac disease.
• Total IgA Levels: Alongside the tTG-IgA test, doctors must measure the child’s total IgA levels. This is incredibly important because individuals with Down syndrome have a higher rate of IgA deficiency. If a child’s total IgA is too low, the standard tTG-IgA test may show a false negative, and alternative testing methods, such as an IgG-based test (like DGP-IgG), will be required to get an accurate result.

The Next Steps After a Positive Screen

If the blood test suggests celiac disease, your child will likely be referred to a pediatric gastroenterologist. They will typically recommend a procedure called an endoscopy with a biopsy of the small intestine to confirm the diagnosis. The endoscopy is a short, common, and minimally invasive procedure performed under sedation, so your child will not feel it.

Crucial Medical Warning: Do not remove gluten from your child’s diet after a positive blood test but before the biopsy. Removing gluten prematurely can allow the intestines to begin healing, which may result in a false-negative biopsy and leave you without a definitive diagnosis ^[11].