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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.
However, to confirm a celiac disease diagnosis, the pediatrician must obtain a tissue sample from the childâs small intestine and inspect for certain changes to the villi. The pediatrician will use a procedure called an endoscopy with biopsy to collect the tissue sample.