Longevity & Aging

At-Home Fingerprick Test Could Detect Alzheimer's Risk Years Before Symptoms

Researchers have shown that a simple at-home fingerprick blood test can identify biological markers linked to Alzheimer's disease, without any clinic visit. In a study of 174 people ranging from healthy adults to those with dementia, self-collected blood samples were analyzed for two key proteins — p-tau217 and GFAP — that signal brain stress long before severe symptoms appear. Results closely matched standard clinic blood draws. Paired with an online memory test, this approach could create a remote early-warning system for cognitive decline, giving people time to act while the brain still has resilience. Elevated GFAP also linked strongly to cardiovascular disease, reinforcing that brain and body aging are deeply connected.