Harvard Health Letter

Brain plaque vs. Alzheimer's gene

Two tests are available to determine if you are at increased risk for getting Alzheimer’s disease: a test for a gene known as APOE4 and a brain imaging test called a PET scan. Research shows that the brain scan is a better predictor. High amounts of beta-amyloid or brain plaque on the scan indicate that the disease has already taken hold. PET scans can be valuable because they can help determine if dementia is due to Alzheimer’s disease.
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