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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.
All celiac disease blood tests require that you be on a gluten-containing diet to be accurate. Tissue Transglutaminase Antibodies (tTG-IgA) â The tTG-IgA test will be positive in about 98% of patients with celiac disease who are on a gluten-containing diet. This is called the testâs sensitivity.