Human brains naturally decline with age, but distinguishing normal memory loss from dementia requires advanced technology often unavailable to many doctors. Researchers have now confirmed that a blood test, which is already clinically available, can accurately detect Alzheimer's disease, supplementing existing diagnostic methods. This breakthrough was led by a team from Lund University in Sweden, who found that specific protein ratios in blood serum can reliably indicate Alzheimer's pathology.

Globally, 55 million people live with dementia, primarily Alzheimer's, which involves a loss of neurons and the accumulation of abnormal proteins beta-amyloid and tau. General practitioners and specialists typically use CT scans, cognitive tests, and patient-reported symptoms to diagnose Alzheimer's, but these methods are not always accurate. The new blood test, less invasive and more convenient, has shown 90 percent accuracy in predicting Alzheimer's, offering a promising tool for earlier and more precise diagnoses, especially in primary care settings.