An international research team reported that a simple blood test can detect early biological markers of Alzheimer's disease several years before memory symptoms become noticeable. The study followed thousands of participants across five countries.
The test measures specific proteins linked to brain changes and combines the results with age and genetic risk factors. In trials, it correctly identified most people who later developed the condition.
Researchers emphasize that the test is a screening tool, not a diagnosis, and that no treatment can yet halt the disease. They hope earlier detection will make future therapies more effective and help patients plan earlier.