Tests that can reveal a person's risk of a disease are an advance of modern medicine. But they are also perceived as a double-edged sword: The ability to diagnose a disease or to predict its arrival has outstripped the ability to treat it.
In the conclusion of a four-part series on genetic testing, NPR's Linda Wertheimer talks with NPR's Joe Palca about the various dilemmas the medical tests pose: from personal choices to the reactions of insurance companies and employers.
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