Cancer Council Australia Colorectal Cancer Guidelines Working Party (2019) recommends the following.

Category 1: Near average risk

For people with category 1 risk of colorectal cancer, an immunochemical faecal occult blood test (iFOBT) should be performed every two years from age 50 to age 74.

Full examination of the large bowel by colonoscopy is recommended for people who have a positive iFOBT.

Category 2: Moderately increased risk

For people with category 2 risk of colorectal cancer, offer iFOBT every two years starting at age 40, then colonoscopy every five years starting at age 50. CT colonography may be offered if colonoscopy is contraindicated.

Category 3: High risk

For people with category 3 risk of colorectal cancer, offer iFOBT every two years starting at age 35, then colonoscopy every five years from age 45 to age 74. CT colonography may be offered if colonoscopy is not feasible.

Consider referral to a familial cancer service for further risk assessment and possible genetic testing.

Refer to a bowel cancer specialist to plan appropriate surveillance and management.