Anonymous24 minutes ago
The American Cancer Society on May 27, 2026 added blood-based tests to its colorectal cancer screening guidelines for the first time, endorsing Guardant Health's Shield as an option for adults who decline colonoscopy or stool tests. While the move could reach millions of unscreened Americans, the blood test detects only 83% of cancers and just 13% of precancerous polyps — and fewer than half of patients with positive results complete the follow-up colonoscopy needed to act on the findings.