Celiac Disease Management

Diagnostic Criteria

• The European Society for Pediatric Gastroenterology, Hepatology, and Nutrition recommends measuring total IgA serum levels to rule out IgA deficiency, and if deficient, using IgG-TG2 or IgG-DGP instead 1
• Characteristic histological findings include increased intraepithelial lymphocytes (≥25/100 enterocytes), crypt hyperplasia, and villous atrophy, as stated by the European Society for Pediatric Gastroenterology, Hepatology, and Nutrition 1
• The primary serological test for celiac disease is IgA tissue transglutaminase antibody (tTG-IgA), with a sensitivity of 97.7% and specificity of 70.2% in children, as reported by the European Society for Pediatric Gastroenterology 2, 3, 4
• The following table summarizes the sensitivity and specificity of serological tests:

• Total serum IgA levels should be checked to rule out IgA deficiency, which could affect test interpretation, with a strength of evidence rated as high, as recommended by the American Gastroenterological Association 5
• Upper endoscopy with multiple duodenal biopsies is mandatory for diagnosis, with at least 6 specimens collected: 1-2 from the bulb and at least 4 from the distal duodenum, as recommended by the American Academy of Family Physicians 6
• Duodenal biopsy is the gold standard for diagnosis if serology is positive, as stated by the European Society for Pediatric Gastroenterology, Hepatology and Nutrition 1
• Histological assessment through upper endoscopy with multiple duodenal biopsies (at least 6 specimens) is the gold standard for evaluating mucosal healing, with serological tests having low sensitivity (<50%) for detecting persistent villous atrophy in patients on a gluten-free diet 1, 7

Genetic Testing

• Genetic testing (HLA-DQ2/DQ8) is not recommended for routine diagnosis, but is useful in specific situations, such as seronegative cases with suspected celiac disease, equivocal small-bowel histologic findings, or high-risk populations, according to the American Academy of Family Physicians 6
• A negative predictive value of >99% is associated with negative HLA-DQ2 and HLA-DQ8 results, making celiac disease highly unlikely, as stated by the American Academy of Family Physicians 6
• The presence of HLA DQ2 indicates genetic susceptibility to celiac disease, with 30-40% of the general population carrying HLA DQ2, although only 2-3% of these individuals develop celiac disease during their lifetime, as reported by the American Gastroenterological Association 8
• If a patient is HLA DQ2 and DQ8 negative, they have <1% chance of having celiac disease, according to the European Society for Pediatric Gastroenterology, Hepatology and Nutrition 1

Treatment

• The European Society for Pediatric Gastroenterology, Hepatology, and Nutrition recommends a strict lifelong gluten-free diet as the only currently effective treatment, which should be supervised by a specialized nutritionist 1
• Implementation of a strict gluten-free diet under the guidance of a registered dietitian experienced in celiac disease is recommended, with a strength of evidence rated as moderate, as suggested by the American Diabetes Association 5
• Nutritional assessment and supplementation for any deficiencies (iron, folate, vitamin B12) should be performed if diagnostic testing confirms celiac disease, as recommended by the American Gastroenterological Association 3
• Bone mineral density assessment should be performed to evaluate for osteoporosis if diagnostic testing confirms celiac disease, as recommended by the American Gastroenterological Association 3

Monitoring and Follow-up

• Serological monitoring with anti-TG2 antibodies at 6 months, 12 months, and annually thereafter is recommended, with negative serology not guaranteeing intestinal healing, and persistently positive serology usually indicating ongoing intestinal damage and gluten exposure, as stated by the American College of Gastroenterology 7, 2
• Clinical assessment, including annual evaluation for symptom resolution, nutritional status, and weight management, is also important, according to the American Gastroenterological Association 2
• Patients should be monitored for complications, as persistent symptoms despite adherence to a gluten-free diet may indicate refractory celiac disease or development of complications like enteropathy-associated T-cell lymphoma, as recommended by the European Society of Urology 9
• Video capsule endoscopy is recommended for patients with refractory celiac disease and unexplained symptoms despite treatment, as suggested by the American Gastroenterological Association 10

Special Considerations

• First-degree relatives have a 7.5% risk of developing celiac disease, and patients with type 1 diabetes, autoimmune thyroid disease, Down syndrome, Turner syndrome, and unexplained iron deficiency anemia are also at increased risk, as noted by the American Gastroenterological Association 2
• In children under 2 years, the American Academy of Family Physicians recommends combining tTG-IgA with IgG and IgA deamidated gliadin peptides for improved sensitivity 6
• For seronegative patients with villous atrophy and genetic risk factors, endoscopic evaluation after 1-3 years on a gluten-free diet is recommended by the Gastroenterology society 8
• Seronegative celiac disease is characterized by villous atrophy with negative serology, requiring the exclusion of other causes of atrophy and evaluation of response to a gluten-free diet, as stated by the European Society for Pediatric Gastroenterology, Hepatology and Nutrition 1