Tissue transglutaminase IgA (TTGA) antibodies are used to screen for coeliac disease and dermatitis herpetiformis. Endomysial antibodies are used to confirm coeliac disease in patients with weak titres of TTGA antibodies only. Endomysial antibodies correlate well with TTGA and will decrease with adherence to a gluten-free diet. As IgA deficiency is common in this group of patients, serum IgA levels should also be checked.
RST (rust top)
5-10 mL (1 mL serum)