Log faecal calprotectin concentration (mg/l) in the different diagnostic groups. Log faecal calprotectin concentration (mg/l) in the different diagnostic groups. Median values with 95% (+) and 5% (–) confidence intervals are shown. All three diagnostic groups differed significantly from controls (normal/irritable bowel syndrome, p=0.01; adenomatous polyps, p=0.0003; cancer p<0.0001). J Tibble et al. Gut 2001;49:402-408 Copyright © BMJ Publishing Group Ltd & British Society of Gastroenterology. All rights reserved.