Evidence check: tTG IgA in the context of Darmgesundheit

The provided context contains no information about tTG IgA (tissue transglutaminase IgA) in relation to gut health. tTG IgA is a well-established serological marker for screening celiac disease, an autoimmune enteropathy triggered by gluten. A positive tTG IgA result indicates active celiac disease but requires confirmatory duodenal biopsy. Sensitivity and specificity exceed 90% when total IgA is measured to rule out IgA deficiency. In practice, tTG IgA is often combined with endomysial IgA (EMA) and deamidated gliadin peptides (DGP). Important: A negative test does not fully exclude celiac disease, especially in IgA deficiency or early disease stages. The modules provided here (APOA2 gene, SIRT1, rs601338, home blood test instructions) are not relevant for evaluating tTG IgA. Therefore, the evidence level from the given context is unclear. Consumers should be aware that home tests for tTG IgA exist, but interpretation always requires a physician. A positive result without medical follow-up can lead to unnecessary diets or missed diagnoses. The evidence for tTG IgA as a screening tool is strong (human-strong), but the context does not support it.