A Blood Test That Detects Alzheimer’s Disease Years Before Brain Scans Can Just Took a Major Leap Forward — Harvard Study Confirms It Outperforms PET Imaging in Early Detection

Harvard Mass General Brigham study in Nature Communications (April 2026): plasma pTau217 blood test detects Alzheimer’s progression years before PET scans. FDA already cleared Lumipulse pTau217 test for symptomatic patients.