Medscape July 14, 2025
Given the opportunity, 90% of Americans say they would take a blood biomarker test for Alzheimer’s disease (AD) — even in the absence of symptoms. Notably, 80% say they wouldn’t wait for a physician to order a test, they’d request one themselves.
The findings, from a recent nationwide survey by the Alzheimer’s Association, suggest a growing desire to predict the risk for or show evidence of AD and related dementias with a simple blood test. For consumers with the inclination and the money, that desire can now become reality.
Once limited to research settings or only available via a physician’s order, blood-based diagnostics for specific biomarkers — primarily pTau-217 and beta-amyloid 42/20 — are now offered by at least four...







