'For many people, a routine blood test is easier to get than a colonoscopy or a fecal sample test. But the blood test, made by Guardant Health of Palo Alto, Calif., comes with a limitation. Unlike other screening tests for colon and rectal cancers, it has a poor record of finding precancerous growths. Removal of those growths can prevent cancer.'

https://www.nytimes.com/2024/07/29/health/colon-cancer-blood-test-shield.html