A new blood test using a finger prick can diagnose Alzheimer's at early stages, as found in a Europe-wide study. This method, not yet clinically available, could allow home sample collection, enhancing accessibility. The study involved 337 patients across seven European countries and showed an 86% accuracy in identifying disease-related changes. Researchers focused on three biomarkers linked to Alzheimer's. The findings could revolutionize Alzheimer's research and enable large-scale screenings, addressing the increasing prevalence of the disease in Europe.