Dr. Chicoine discusses testing for celiac disease in adults with Down syndrome. Source: Advocate Medical Group Adult Down Syndrome Center Tags:anti-tissue transglutaminase antibody IgAblood testsceliacceliac diseaseceliac disease testingceliac testingdistal duodenal biopsyendoscopyGliadin IgA IgGglutengluten intolerantIgA deficiencyIgA tTGAtotal globulin