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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.
It is useful to test blood for the HLA-DQ2 and HLA-DQ8 genetic markers in the following people: 1  Relatives of diagnosed people with Celiac Disease. 2  People with negative blood tests who exhibit manifestations of Celiac Disease. 3  People with ambiguous biopsy results. 4  People who started a gluten-free diet before diagnostic testing.