Table 2.

Surveillance intervals and strategies

	High Risk (Annually)	Intermediate Risk (every 3 years)	Low Risk (every 5 years)
Risk Stratified Intervals
NICE, ECCO, and BSG(85–87)	Pancolitis with moderate-severe inflammation; strictures or dysplasia within past 5 years (± surgery), PSC, or family history of CRC in first degree relative > 50 years	Pancolitis with active inflammation (endoscopic or histologic); presence of pseudopolyps, or family history of CRC in first degree relative > 50 years	Pancolitis without inflammation (endoscopic or histology); left sided UC or CD of similar extent (i.e. < 50% mucosa involved)*
Non-Stratified Intervals
ASGE, ACG and AGA(78, 88, 89)	Active inflammation (any severity), anatomic abnormalities (foreshortened colons, strictures or pseudopolyps), history of dysplasia, PSC, or family history of CRC in first degree relative (irrespective of age)	Extension to 1–3 years considered after 2 consecutive negative surveillance colonoscopies and no inflammation (no specification on how to lengthen interval)	No recommendation to extend to 5 year intervals

^*ECCO guidelines do not have specific low-risk criteria. Low risk is those without high or intermediate risk.

NICE: National Institute of Health and Clinical Excellence; ECCO: European Crohn’s and Colitis Organization; BSG: British Society of Gastroenterology; ASGE: American Society of Gastrointestinal Endoscopy; ACG: American College of Gastroenterology; AGA: American Gastroenterology Association; PSC: Primary sclerosing cholangitis; CRC: colorectal cnacer; UC: ulcerative colitis; CD: Crohn’s disease