Dr. David Ahlquist explains in detail about the new DNA testing from a person's stool and does not require any preparation . The ultimate plus is that because this new testing is such patient friendly that many lives will be saved.
Mayo clinic and Exact Science of Madison ,WI have collaborated together to develop a highly accurate and sensitive DNA test that will in detecting pre-cancerous tumors in the colon and the early stages of cancer.
Go to the following link to watch Dr. David Ahlquist on video.
Also you can read more at http://newsblog.mayoclinic.org/