Ongoing surveillance should be performed in all patients apart from those with proctitis [EL3]. Patients with high-risk features [e.g. stricture or dysplasia detected within the past 5 years, primary sclerosing cholangitis, extensive colitis with severe active inflammation] should have their next surveillance colonoscopy scheduled for 1 year [EL4]. Patients with intermediate risk factors should have their next surveillance scheduled for 2 to 3 years. Intermediate risk factors include extensive colitis with mild or moderate active inflammation, post-inflammatory polyps, or a family history of colorectal cancer in a first-degree relative diagnosed at age 50 years and above [EL5]. Patients with neither intermediate nor high-risk features should have their next surveillance colonoscopy scheduled for 5 years [EL5]