ist reis glutenfrei oder nicht — which blood markers matter?

Yes, rice is naturally gluten-free. However, cross-contamination can occur in processed rice products (e.g., rice flakes, rice bread) or during manufacturing with gluten-containing grains. For a gluten-free diet in celiac disease or gluten sensitivity, certified products are recommended. Which blood markers matter: The primary marker for celiac disease is IgA antibody against tissue transglutaminase (tTG-IgA). If IgA deficiency is suspected, IgG-based tTG or endomysial antibodies (EMA) are measured. Deamidated gliadin peptide (DGP) antibodies can also be useful. These tests must be ordered and interpreted by a physician, as a positive result requires duodenal biopsy for confirmation. For non-celiac gluten sensitivity, no validated blood marker exists; diagnosis is by exclusion and diet. Caveat: At-home blood test kits may provide initial clues but do not replace clinical diagnosis. Evidence for rice being gluten-free is strong, as are the celiac markers. Sources: DGVS guidelines and recent studies (e.g., PMID 31975151).