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A simple blood test diagnoses Alzheimer’s with 94.5% accuracy

Ellsworth Toohey
Feb 25, 2026
∙ Paid

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Doctors correctly diagnose Alzheimer’s disease about 75.5% of the time using standard clinical evaluations. A simple blood test bumps that number to 94.5%.

The study, published in the Journal of Neurology, tracked 200 patients — all 50 or older — who showed up at neurology clinics in Spain with cognitive complaints. The test m…

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