The test can detect cancerous DNA from tumors that make their way into the bloodstream. However, a colonoscopy remains the gold standard for screening.
The 10-year trial examined the effects of colonoscopy screenings on colorectal cancer risk and related deaths in people in Poland, Norway, Sweden, and the Netherlands.
From how long a colonoscopy will take to how much of your body is exposed, a leading gastroenterologist addresses frequently asked concerns about the exam.