CD79A and celiac disease: For the “no-biopsy” approach, the following tests were used for the measurement of TTG2 IgA: n = 23 Phadia100 (chemiluminescence immunoassay, cut-off value 10, Thermo Fisher, Waltham, MA, USA), n = 18 BIO-FLASH (chemiluminescence immunoassay, cut-off value 20, Werfen, Bedford, MA, USA), n = 10 EUROLINE Coeliac Disease Profile (Western blot, cut-off value 10, EUROIMMUN, Lübeck, Germany), n = 4 enzyme immunoassay (ELISA, cut-off value 50, D-Tek, Mons, Belgium) and n = 3 not specified test with cut-off value 20.