What should I know about zoliakie test?

The question concerns a celiac disease test. The provided context does not contain specific information about celiac testing. In general, celiac testing involves serology (tTG-IgA, total IgA) and, if positive, duodenal biopsy. Genetic testing for HLA-DQ2/DQ8 can rule out celiac disease but cannot confirm it. Direct-to-consumer tests (e.g., stool or saliva) often lack clinical validation and should not replace standard medical diagnosis. If celiac disease is suspected, a physician should perform guideline-based testing. Home tests have weak evidence; they may yield false negatives or positives. Caveat: Do not start a gluten-free diet before testing, as it can lower antibody levels. The provided sources contain no data on celiac diagnostics.