Table 4.

Old and new WHO criteria for serrated polyposis

2010 criteria 9		2019 criteria 13
1	At least five serrated polyps proximal to the sigmoid colon with two or more of these being >10 mm	1	≥5 serrated lesions/polyps proximal to the rectum, all being ≥5 mm in size, with ≥2 being ≥10 mm in size
2	Any number of serrated polyps proximal to the sigmoid colon in an individual who has a first‐degree relative with serrated polyposis	NA	NA
3	>20 serrated polyps of any size, but distributed throughout the colon	2	>20 serrated lesions/polyps of any size distributed throughout the large bowel, with ≥5 being proximal to the rectum

NA, Not applicable.