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Background & Aims: Mucosal healing is an important predictor of disease-related outcome in patients with inflammatory bowel disease (IBD) patients, including those in clinical remission. However, colonoscopy is an invasive procedure and many patients decline repeated endoscopic examinations. We aimed to assess whether noninvasive biomarkers could accurately detect endoscopic mucosal inflammatory activity in IBD patients in clinical remission. Methods: We conducted a prospective observational cohort study on IBD patients in clinical remission at Colentina Hospital, Bucharest. Clinical activity was assessed using the Mayo score and Crohn's Disease Activity Index (CDAI), quality of life was assessed using the Short Inflammatory Bowel Disease Questionnaire (SIBDQ). Serum C-reactive protein (CRP) and fecal calprotectin (FC) levels were determined. All patients underwent ileo-colonoscopy to assess mucosal inflammatory activity. Results: 48 patients were included in this study, with 67% showing endoscopic disease activity. SIBD questionnaire and FC performed well as noninvasive markers of intestinal inflammation (AUROC 0.78 and 0.77, respectively), while CRP could not accurately predict endoscopic disease activity. Fecal calprotectin levels > 30 μg/g showed a 93% sensitivity and a 50% specificity for detecting inflammatory changes of the mucosa while a combined test using FC > 30 μg/g and a SIBDQ score < 6 achieved 81.2% sensitivity and 75% specificity, respectively, in detecting active endoscopic disease. Conclusion: Fecal calprotectin and SIBDQ have good diagnostic accuracy in detecting mucosal inflammatory changes in IBD patients in clinical remission. Combining simple, noninvasive tests such as the SIBDQ and FC levels appears to be a practical method for monitoring disease activity in these patients, possibly reducing the need for repeat endoscopic examinations. [ABSTRACT FROM AUTHOR]