Serologic tests for celiac disease include. tissue transglutaminase (tTG) immunoglobulin A (IgA) and tTG immunoglobulin G (IgG) tests. endomysial antibody (EMA) -IgA test. deamidated gliadin peptide (DGP) -IgA and DGP-IgG tests. The serologic tests that check for IgA antibodies are more sensitive for celiac disease than the tests for IgG.