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Receiver operator characteristic (ROC) curve for fecal calprotectin (FC) and endoscopic disease activity in ulcerative colitis (UC) patients. The AUC for FC and endoscopic activity in UC was 0.97 (95% CI [0.91–1]; P < 0.001). A cut‐off value of FC 100 μg/g had a sensitivity of 88% and a specificity of 100%.
