What role does tTG IgA play in gut health?

tTG IgA (anti-tissue transglutaminase IgA antibodies) is a well-established serological biomarker for celiac disease, not for general gut health. In celiac disease, gluten ingestion triggers an immune response that damages the small intestinal lining and releases tTG IgA. A positive test strongly indicates active celiac disease, provided the patient is on a gluten-containing diet. Evidence is human-strong: guidelines (e.g., ESPGHAN) often allow diagnosis in children based on high tTG IgA titers plus positive EMA alone. However, tTG IgA is not a general gut health marker – it does not reflect irritable bowel syndrome, dysbiosis, or other intestinal conditions. Caveat: IgA deficiency can cause false negatives; IgG-based testing is then needed. Also, elevated tTG IgA can occur without celiac disease (e.g., autoimmune hepatitis). For consumer tests: a positive tTG IgA result from a home test requires medical confirmation and small bowel biopsy. Interpretation must always be in clinical context. In summary: tTG IgA is a specific, but not a general, gut health marker.