Receiver-operator characteristic curve (ROC) for faecal calprotectin levels predicting for clinical relapse within 6 months in asymptomatic patients with Crohn's disease (area under the curve 0.886 p<0.001). Receiver-operator characteristic curve (ROC) for faecal calprotectin levels predicting for clinical relapse within 6 months in asymptomatic patients with Crohn's disease (area under the curve 0.886 p<0.001). James Turvill Frontline Gastroenterol 2014;5:167-175 Copyright © BMJ Publishing Group Ltd & British Society of Gastroenterology. All rights reserved.