Myths vs facts: Zöliakie Test and gut health

The question of myths vs facts regarding celiac testing and gut health is important because misinformation is widespread. A common myth is that a stool test or food sensitivity panel can reliably diagnose celiac disease. The fact is: diagnosis requires a specific blood test for IgA antibodies to tissue transglutaminase (tTG-IgA), followed by an upper endoscopy with duodenal biopsy if positive. Another myth is that you should avoid gluten before testing – in reality, you must continue eating gluten for several weeks to avoid false negatives. Some believe a genetic test (HLA-DQ2/DQ8) can confirm celiac, but it can only rule it out; most people with these genes never develop the disease. Gut microbiome tests marketed directly to consumers are not validated for celiac diagnosis and may lead to unnecessary dietary restrictions. The evidence for standard celiac diagnostics is strong (human studies), whereas many commercial tests lack clinical validation. If you suspect celiac, consult a gastroenterologist and do not start a gluten-free diet before proper testing.