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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.
The performance of the tTG-IgA test may depend on the degree of intestinal damage, making the test less sensitive among people with milder celiac disease. In addition to screening, the tTG test may be used to assess initiation and maintenance of a gluten-free diet.