New blood test accurately predicts Alzheimer's symptom onset

A new blood test can predict the onset of Alzheimer's symptoms with high accuracy. This could revolutionize early detection of the disease. Researchers analyzed blood protein p-tau217, finding its concentration correlates with brain amyloid and tau buildup. This allows prediction of symptom onset within a three to four-year range. The study, published in Nature Medicine, involved 603 participants. This accessible test offers a cheaper alternative to current invasive and expensive diagnostic methods.