National Geographic | Alzheimer's Tests on the Horizon? National Geographic Those with positive PET scans had a much greater rate of cognitive decline and were more likely to have been diagnosed with dementia than those whose scans had been negative. But even a positive scan is not a perfect predictor, Doraiswamy cautions: "It ... New Health Affairs: Implications Of Alzheimer's And The State Of Research Pros and Cons of Testing for Dementia, from the April 2014 Harvard Women's ... Alzheimer's Symposium to address dementia care |