CRP and bacterial urinary tract infection: Laboratory data revealed that median WBC, C-reactive protein (CRP), blood urea nitrogen (BUN), and creatinine levels were higher in patients with UTI caused by ESBL-producing organism as compared to patients with UTI caused by non-ESBL producing organism (p = 0.015, p = 0.288, p = 0.269, and p = 0.063, respectively) (Table 5).