CD79A and glomerular disorder: Serum total IgA levels in children with IgAN < 12 years were not significantly elevated (180 mg/dl, 86-450 mg/dl) compared with those in children with non‐IgA glomerular diseases < 12 years (129 mg/dl, 49-281 mg/dl) and HCs < 12 years (183 mg/dl, 91-295 mg/dl).