Breakthrough Alzheimer’s blood test could detect disease 15 years before symptoms emerge
A simple Alzheimer’s blood test trialed in Sweden can detect the disease’s biological signs up to 15 years before symptoms appear, matching the accuracy of a spinal tap in a study of 786 people. The test measures p-tau217, a protein that builds up in the blood as Alzheimer’s-related changes unfold in the brain. Researchers suggest it could one day be as routine as a cholesterol check for anyone over 50, replacing painful lumbar punctures and hard-to-access specialist scans. With one in three people born in the U.K. today expected to develop dementia, catching the disease early — while there’s still time to intervene — could transform how the world confronts one of its most feared illnesses.









