- New blood test (p‑tau217) can flag which apparently healthy older adults are more likely to develop Alzheimer’s symptoms years ahead — a tool that could speed clinical trials but isn’t recommended for routine screening yet.
- People with very high p‑tau217 had about a 38% chance of cognitive impairment in 5 years and 78% in 10 years; very low levels meant low risk.
- Experts urge caution — the test isn’t precise enough for individual prognoses, long‑term numbers are limited, and doctors say to wait for effective treatments and meanwhile focus on healthy habits.
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