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A simple blood test might soon be able to predict the risk of Alzheimer's'

Fats in the blood can predict Alzheimer's risk at least 3 years before clinical diagnosis. More importantly could this insight lead to new therapies.
But - with no curative intervention does possible knowledge that this dreadful disease is on the way offer a balance to the distress caused by that very knowledge? Would national screening be offered, or the test be for sale in a pharmacy/private clinic. The insurance implications - as many of us sitting on clinical ethics committees advance in years - are extremely challenging!