Celiac Disease Diagnosis and Management

Diagnostic Evaluation

• The European Society of Gastrointestinal Endoscopy recommends reviewing prior diagnostic testing, including serologies, endoscopies, and histologic findings, to confirm the initial diagnosis of celiac disease 1
• The European Society of Gastrointestinal Endoscopy suggests performing serologic testing, arranging dietitian review of dietary habits, and considering testing for immunogenic peptides in stool or urine to evaluate for ongoing gluten exposure 1
• The American Academy of Family Physicians recommends serological testing followed by intestinal biopsy for the diagnosis of celiac disease in children, with lifelong strict gluten-free diet as the only effective treatment 2
• First-line screening tests include:
• The gold standard for diagnosis is upper endoscopy with multiple duodenal biopsies (1-2 from bulb and at least 4 from distal duodenum), showing characteristic findings such as villous atrophy, crypt hyperplasia, and increased intraepithelial lymphocytes (≥25/100 enterocytes) 2, 4
• Sensitivity and specificity of diagnostic tests:

• First-degree relatives of children with celiac disease should be considered for screening even if asymptomatic 2
• Screening for type 1 diabetes is recommended at diagnosis, then repeated within 2 years and again after 5 years 3

Dietary Management

• Patients with celiac disease should strictly avoid all foods containing wheat, rye, barley, and oats, as these grains contain gluten, the protein that triggers the intestinal inflammatory response in this disease, according to the European Society for Pediatric Gastroenterology, Hepatology and Nutrition 5
• Prioritize naturally gluten-free foods over processed products labeled as "gluten-free" 5
• Incorporate nutritious alternative grains such as quinoa, amaranth, and buckwheat, which provide proteins, fiber, vitamins, and minerals 5
• Safe alternatives include naturally gluten-free foods (rice, corn, potatoes), alternative grains (buckwheat, amaranth, quinoa, millet, sorghum), and certified gluten-free oats (most patients can tolerate), as recommended by the Nature Reviews Gastroenterology and Hepatology, the American Gastroenterological Association, and the European Society for Pediatric Gastroenterology, Hepatology, and Nutrition 4, 5, 6, 2
• Consume daily: extra virgin olive oil, dairy products (preferably natural yogurt with probiotics), fresh vegetables and fruits, legumes, and nuts 5
• Consume weekly: fish (especially those rich in omega-3), potatoes, white meats in moderation, and limit red and processed meats 5
• Patients following vegetarian or vegan diets should pay special attention to including legumes, nuts, meat alternatives, and fortified plant-based milks (preferably soy) 5

Treatment and Follow-up

• The primary treatment for celiac disease is a strict, lifelong gluten-free diet (GFD) with complete elimination of wheat, barley, and rye proteins, as advised by the Celiac Disease Foundation, the American Gastroenterological Association, and the American Academy of Family Physicians 7, 4, 2
• Dietary guidance from a dietitian experienced in pediatric nutrition and celiac disease management is mandatory 2
• Regular follow-up with both physician and dietitian is essential to monitor skin symptoms improvement, dietary adherence, and serological markers, according to the National Institute of Diabetes and Digestive and Kidney Diseases, the American Gastroenterological Association, and the American Academy of Family Physicians 7, 4, 2
• Monitoring should also include nutritional status and deficiencies (iron, folate, vitamin B12, vitamin D) to ensure proper management, as suggested by the American College of Gastroenterology and the American Gastroenterological Association 7, 4
• Serological testing (tTG-IgA, EMA-IgA) should be performed at 6 and 12 months after diagnosis and annually thereafter, as recommended by the American Gastroenterological Association and the American Academy of Family Physicians 7, 8
• If symptoms persist despite reported adherence to treatment, reassess dietary compliance with expert dietitian consultation, consider inadvertent gluten exposure or cross-contamination, and investigate alternative causes, such as microscopic colitis or small intestinal bacterial overgrowth, as recommended by the American Gastroenterological Association, the American Academy of Family Physicians, and the Gastroenterology 7, 2, 4
• Consider refractory celiac disease if villous atrophy persists despite strict GFD adherence, according to the American Gastroenterological Association and the Gastroenterology 4, 7

Endoscopic Evaluation

• The European Society of Gastrointestinal Endoscopy recommends endoscopic evaluation with esophagogastroduodenoscopy and small bowel biopsies to assess for persistent villous atrophy if symptoms persist 1
• The European Society of Gastrointestinal Endoscopy suggests using flow cytometry, immunohistochemistry, and T-cell receptor rearrangement studies to distinguish between Type 1 and Type 2 refractory celiac disease (RCD) 1
• The European Society of Gastrointestinal Endoscopy recommends investigating other causes of diarrhea, including functional bowel disorders, microscopic colitis, pancreatic insufficiency, inflammatory bowel disease, lactose or fructose intolerance, and small intestinal bacterial overgrowth (SIBO), if gluten-free diet adherence is confirmed 1

Psychosocial Support

• Address social limitations and psychological impact of celiac disease, and consider referral to support groups, as recommended by the American Gastroenterological Association, the Gastroenterology, and the American Academy of Family Physicians 4, 7, 2
• Recognize economic burden of GFD (higher cost of gluten-free products), according to the American Gastroenterological Association and the American Academy of Family Physicians 4, 2
• A mandatory dietitian referral for all newly diagnosed patients is recommended by the American Gastroenterological Association, the Nature Reviews Gastroenterology and Hepatology, and the European Society for Pediatric Gastroenterology, Hepatology, and Nutrition 7, 5, 6, 2
• Correct identified deficiencies with appropriate supplementation, and focus on balanced nutrition with adequate fiber, B vitamins, iron, and trace minerals, emphasizing naturally gluten-free foods over processed gluten-free products, as recommended by the Nature Reviews Gastroenterology and Hepatology and the American Gastroenterological Association 7, 5