What to watch with Zöliakie Test and Haut?

A celiac test (blood test for tTG-IgA, endomysial antibodies) is the first step when celiac disease is suspected. Skin manifestations like dermatitis herpetiformis (itchy blisters on elbows, knees, buttocks) are pathognomonic for celiac but can also occur in other autoimmune conditions. A positive celiac test requires confirmation via duodenal biopsy. Importantly, the test is only valid on a gluten-containing diet. For skin symptoms without GI issues, a skin biopsy (direct immunofluorescence for IgA deposits) should be considered. The provided contexts lack specific information on celiac or skin. Evidence is based on established medical guidelines. Caveat: A negative test does not fully rule out gluten-sensitive dermatitis.