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flag A new blood test may predict Alzheimer’s onset within 3–4 years, but isn’t yet reliable for healthy people.

flag A blood test measuring p-tau217 protein shows promise in predicting Alzheimer’s symptom onset within a three- to four-year window, years before signs appear, based on a study of over 600 older adults. flag The test, which detects early brain changes linked to Alzheimer’s, is less invasive and cheaper than scans or spinal taps, and two versions are already FDA-approved for symptomatic patients. flag However, experts caution it’s not yet reliable for healthy individuals due to variability from conditions like kidney disease or obesity, and results remain too uncertain for personal decisions like retirement. flag While the tool could aid clinical trials for preventive treatments, broader use depends on further validation and proven interventions that improve outcomes.

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