Serum Gd-IgA1 levels in children with IgAN < 12 years were significantly elevated (5888 ng/ml, 1738–8913 ng/ml) compared with those in children with non‐IgA glomerular diseases < 12 years (1995 ng/ml, 407–12022 ng/ml) (p < 0.0001) and HCs < 12 years (513 ng/ml, 2042–5888 ng/ml) (p < 0.001) as well as those in children with IgAN ≥ 12 years (8709 ng/ml, 3802–18621 ng/ml) compared with children with non‐IgA glomerular diseases ≥ 12 years(3802 ng/ml, 1096–11482 ng/ml) (p < 0.05) and HCs ≥ 12 years (2692 ng/ml, 537–6166 ng/ml) (p < 0.001). Here, IGHA1 is linked to glomerular disorder.