A blood test can detect whether plaques of beta-amyloid are building up in a person’s brain – a sign that they may develop Alzheimer’s disease. Amyloid plaques start developing 15 to 20 years before the symptoms of Alzheimer’s disease start to show.

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A blood test can detect whether plaques of beta-amyloid are building up in a person’s brain – a sign that they may develop Alzheimer’s disease. Amyloid plaques start developing 15 to 20 years before the symptoms of Alzheimer’s disease start to show.