Table 1.

The World Health Organization's clinical criteria for the identification of serrated polyposis

Criterion A	At least five serrated polyps proximal to the sigmoid colon, two of which are greater than 10 mm in diameter
Criterion B	Any number of serrated polyps occurring proximal to the sigmoid colon in an individual who has a first-degree relative with serrated polyposis
Criterion C	More than 20 serrated polyps of any size distributed throughout the colon

A diagnosis of serrated polyposis syndrome can be made if a patient fulfils any of these criteria.