I researched this and it seems that these tests (I'm assuming like Cologuard) miss a good number of precancerous polyps. One gastroenterology website said:
Because colon cancer begins as growths called polyps,
finding and
removing polyps is the best way to prevent colon cancer. There are three types of CRC screening:
- Colonoscopy – 95% of large polyps detected
- Stool DNA (Cologuard Test) – 42% of large polyps detected
- Fecal Immunochemical Test (FIT) – 24% of large polyps detected
I wasn't comfortable with the possibility of missed precancers, but I am prone to anxiety and want to always be able to say I took the most precautions.