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Could a simple blood test for Alzheimer's help identify someone at higher risk before memory problems begin? New research suggests it may. Scientists found that a blood test measuring a protein called p-tau217 may help identify healthy older adults who are at a higher risk of developing Alzheimer's disease symptoms within the next 5 to 10 years. While the results are promising, experts emphasize that this test is not yet recommended as a routine screening tool for people with