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New Blood Test Shows Promise in Predicting Alzheimer's Risk for Seniors

KVIA•Wednesday, July 15, 2026 at 6:49 PM•CNN Newsource

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A recent study indicates that older adults with elevated levels of the biomarker p-tau217 in their blood have a 38% higher chance of developing early signs of dementia within five years, and a 78% increased risk over a decade. This breakthrough could change how Alzheimer's is diagnosed, moving away from invasive procedures to a simpler blood test that accurately predicts amyloid plaque accumulation in the brain. However, experts caution that these tests should not be used in isolation and are not recommended for cognitively healthy individuals. The findings will be presented at the Alzheimer’s Association International Conference and published in JAMA, highlighting the need for a comprehensive approach to Alzheimer's risk assessment.

Key Details: • Study shows 38% increased risk of dementia with high p-tau217 levels. • Results to be presented at the Alzheimer’s Association International Conference. • Blood tests should not be used alone for diagnosing Alzheimer's. • Healthy lifestyle changes can help reduce dementia risk by up to 45%.

health research alzheimer dementia biomarkers

People & Organizations

Harvard Medical SchoolRichard IsaacsonRachel BuckleyLaura NisenbaumAlzheimer’s Drug Discovery Foundation

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