IGHA1 and Microscopic hematuria: There was no correlation between serum Gd-IgA1 level and M, E, S, and C parameters, but a positive correlation was noticed with T. The urine Gd-IgA1 levels were positively correlated with 24-h urine protein, microscopic hematuria, and creatinine level, as well as with M, S, and T parameters, suggesting a better clinical relevance between urine Gd-IgA1 and IgAN.