IgA Nephropathy Registration Initiative of High Quality (INSIGHT)

The investigators are registering all biopsy-proven primary IgA nephropathy (IgAN) patients, and developing a IgAN database in China. Patients' demographic characteristics (including age, gender, height, weight, BMI, smoking, drinking, and education), clinical characteristics (including systolic blood pressure, diastolic blood pressure, primary cause of ESRD, and lab measurements of serum and urine), complications, drug information at the baseline will be collected. Patients will be follow-up every one year, the demographic and clinical characteristics, complications and drug information of patients will be collected at each visit. The investigators also record the clinical events at each visit, such as mortality (including all-cause mortality and cardiovascular disease mortality), ESRD (defined as initiation of dialysis or kidney transplantation) and hospitalization for any cause. All-cause and cardiovascular mortality and a composite renal outcome of doubling of serum creatinine and ESRD for IgAN patients will be compared using the IgAN database.