So, these 12 factors were admitted in the multivariate logistic analysis, then we found the history of urological surgery, WBCC, neutrophils, serum CRP, serum albumin, WBCC, grade of hydronephrosis, CT value of hydronephrosis were statistically significant for pyonephrosis (Table 3). The gene discussed is CRP; the disease is urinary tract obstruction.