Then, blood samples were taken for all subjects to measure three biomarkers blindly including C-reactive protein (CRP), erythrocyte sedimentation rate (ESR) and malondialdehyde (MDA), were collected from 30 patients with inflammatory bowel disease (IBD) and 30 healthy control The equal sample size of IBD patients and healthy subjects were taken in order to achieve a higher statistical power of testing diagnostic accuracy. Here, CRP is linked to inflammatory bowel disease.