Clinical studies and laboratory data
The following parameters were collected at the time of the renal biopsy, including gender, age, blood pressure, hematuria, proteinuria, serum uric acid, serum albumin, blood urea nitrogen, serum creatinine and eGFR. To assess the presence of hematuria, 10 ml of clean fresh urine that came from the middle piece was centrifuged for 5 minutes at 1500 rpm; 0.2 ml of sediment was taken and observed under microscopy. The severity of erythrocyturia was characterized as follows: >20 RBC/HPF as 3+. The estimated glomerular filtration rate (eGFR) was calculated using the CKD-epidemiology collaboration (CKD-EPI) formula: eGFR (ml/min per1.73 m2) = 186×Scr-1.154×age-0.203×0.742 (if female) × 1.227