Jon Hamilton, "Alzheimer's Blood Test Raises Ethical Questions", NPR Morning Edition 3/9/2014:
An experimental blood test can identify people in their 70s who are likely to develop Alzheimer's disease within two or three years. The test is accurate more than 90 percent of the time, scientists reported Sunday in Nature Medicine.
The finding could lead to a quick and easy way for seniors to assess their risk of Alzheimer's, says Dr. Howard Federoff, a professor of neurology at Georgetown University. And that would be a "game changer," he says, if researchers find a treatment that can slow down or stop the disease.
But because there is still no way to halt Alzheimer's, Federoff says, people considering the test would have to decide whether they are prepared to get results that "could be life-altering."
But having a prediction with no prospect for a cure is not, in my opinion, the biggest problem with tests of this kind.