FAP can be a childhood onset condition. Screening for polyps begins between ages 7-12. Some physicians even recommend screening for liver tumors starting at birth. Therefore genetic risk assessment is sometimes done in childhood.
Patients with Lynch syndrome or strongly suspected Lynch need to have colonoscopy exams starting at age 20-25, and this needs to be repeated every one to two years. Also, screening for endometrial cancer is recommended and includes transvaginal ultrasound and endometrial biopsy. This is usually initiated between the ages of 25-35 and repeated every year.
Some patients pursue surgery to reduce their cancer risks. Careful screening can increase early detection of subsequent cancers. These cancers usually start young so screening must start before age 50. Although some of these options may reduce the risk for developing colon cancer, no option totally eliminates this risk.