The receiver operating characteristic curve analysis indicated that the cutoff for serum total IgA levels for differentiating IgAN from non-IgA glomerular diseases was 158 ng/ml with a sensitivity of 64.0% and a specificity of 59.1% in children < 12 years and 283 ng/ml with a sensitivity of 80.0% and a specificity of 72.7% in children ≥ 12 years, respectively (Figure 3(e)). The gene discussed is CD79A; the disease is glomerular disorder.