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You may soon be able to get a blood test for Alzheimer’s, but will you want one?

When Daniel Gibbs, M.D., enrolled in an Alzheimer’s study at UC San Francisco almost a decade ago, researchers needed access to a secure government facility just to confirm that he had the disease. They summoned Gibbs to the Lawrence Berkeley National Laboratory, hooked him up to an IV, and wheeled him into a donut-shaped machine called a PET (positron emission tomography) scanner. Then they waited.