HOULD YOU BE allowed to take a blood test that could tell you if you’re already at risk of Alzheimer’s disease? Last year, Quest Diagnostics began offering a consumer-initiated blood test for $399 (not covered by insurance) that detects the buildup of proteins associated with the development of Alzheimer’s in customers’ plasma. Under pressure from other biomarker researchers and the Alzheimer’s Association, offers its test to . But other such tests are poised to come to the consumer market.
