While not a perfect alternative to colonoscopies, experts hope the test could lead to more people getting screened for colorectal cancers. While not a perfect alternative to colonoscopies, experts hope the test could lead to more people getting screened for colorectal cancers. Colon and Colorectal Cancer, Blood, Tests (Medical), Food and Drug Administration, Colonoscopy, Guardant Health Inc, your-feed-science NYT > Science