What is the gold standard for diagnosing celiac disease?

What is the gold standard for diagnosing celiac disease?

• A. Endoscopy with duodenal biopsy
• B. Blood test
• C. Serology
• D. Gluten-free diet

Answer: (A)

Confirming celiac disease requires showing actual gluten-induced damage to the small intestinal lining. The most definitive way to do this is by performing an upper endoscopy and taking multiple duodenal biopsies. The tissue shows characteristic changes—villous atrophy with crypt hyperplasia and increased intraepithelial lymphocytes—that provide clear evidence of disease when interpreted in the right clinical and serologic context. Blood tests and serology, such as anti-tTG or anti-endomysial antibodies, are excellent screening tools with high sensitivity and specificity, but they do not prove mucosal injury by themselves. A gluten-free diet is the treatment, not a diagnostic test; starting it before biopsy can mask histologic changes and complicate diagnosis.

Confirming celiac disease requires showing actual gluten-induced damage to the small intestinal lining. The most definitive way to do this is by performing an upper endoscopy and taking multiple duodenal biopsies. The tissue shows characteristic changes—villous atrophy with crypt hyperplasia and increased intraepithelial lymphocytes—that provide clear evidence of disease when interpreted in the right clinical and serologic context.

Blood tests and serology, such as anti-tTG or anti-endomysial antibodies, are excellent screening tools with high sensitivity and specificity, but they do not prove mucosal injury by themselves. A gluten-free diet is the treatment, not a diagnostic test; starting it before biopsy can mask histologic changes and complicate diagnosis.