Table 2

World Health Organization (WHO) 2019 clinical criteria for the diagnosis of serrated polyposis; presence of any criterion is required for the diagnosis of serrated polyposis*

Criterion 1Presence of at least 5 SPs proximal to the sigmoid colon, all 5 mm in size with at least 2 being > 10 mm in size
Criterion 2Presence of more than 20 SPs of any size distributed throughout the colon with > 5 being proximal to the rectum

  • SP = serrated polyp.

  • ↵* Final polyp count includes any SPs (hyperplastic polyp, sessile serrated lesion with or without dysplasia, traditional serrated adenoma, and unclassified serrated adenoma) and cumulative over multiple colonoscopies.