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Celiac disease blood tests measure the amount of particular antibodies in the blood. The most common tests include: Tissue transglutaminase antibody (tTG), IgA class â the primary test ordered to screen for celiac disease.
That's why some celiac disease experts advise performing all the tests togetherâyou can get a more complete picture that way. In some cases, people who have type 1 diabetes, thyroid disease, and autoimmune liver disease test positive on one of these tests, the tTG-IgA test, due to their other conditions. tTG stands for tissue transglutaminase, an enzyme normally present in the intestines.