What is required for formal diagnosis of celiac disease?

What is required for formal diagnosis of celiac disease?

• A. Serology Testing
• B. Intestinal Biopsy
• C. Serology Testing and Intestinal Biopsy
• D. Gluten-Free Diet Trial

Answer: (C)

Formal diagnosis of celiac disease relies on objective confirmation that combines serology with tissue proof from the small intestine. Positive serology (for example, tTG or EMA antibodies) indicates an immune reaction to gluten, but it can be misleading in isolation due to false positives or issues like IgA deficiency. The definitive confirmation comes from an intestinal biopsy showing mucosal damage—classically villous atrophy with increased intraepithelial lymphocytes in the duodenum or proximal jejunum. When serology is positive and biopsy shows compatible histology, the diagnosis is established. A gluten-free diet trial is not enough to diagnose, since it doesn’t provide histologic evidence or a definitive test result. If IgA deficiency is present, IgG-based serology tests are used to avoid false negatives.

Formal diagnosis of celiac disease relies on objective confirmation that combines serology with tissue proof from the small intestine. Positive serology (for example, tTG or EMA antibodies) indicates an immune reaction to gluten, but it can be misleading in isolation due to false positives or issues like IgA deficiency. The definitive confirmation comes from an intestinal biopsy showing mucosal damage—classically villous atrophy with increased intraepithelial lymphocytes in the duodenum or proximal jejunum. When serology is positive and biopsy shows compatible histology, the diagnosis is established. A gluten-free diet trial is not enough to diagnose, since it doesn’t provide histologic evidence or a definitive test result. If IgA deficiency is present, IgG-based serology tests are used to avoid false negatives.