Systematic review of colorectal cancer screening guidelines for average-risk adults: Summarizing the current global recommendations

Table 4 Recommended test in terms of available resources according to World Gastroenterology Organization’s colorectal cancer screening cascade

Level of recommendation	Recommended screening test
1	Colonoscopy every 10 yr
2	Colonoscopy, once in a lifetime
3	FS every 5 yr, followed by a colonoscopy if FS was positive
4	FS, once in a lifetime, followed by a colonoscopy if FS was positive
5	FS, once in a lifetime, followed by a colonoscopy only if advanced neoplasia is detected
6	Fecal blood test annually, followed, if positive, by a colonoscopy or barium enema (depending on colonoscopy’s availability)

FS: Flexible sigmoidoscopy.