Questions Arise about Overuse of Test

Today's New York Times has an article on the controversy over the NC-stat, a nerve-testing system made by Neurometrix (Waltham, MA). Some doctors say it is by far the best way to diagnose carpal tunnel syndrome and other conditions involving nerve damage. Others say that the company has been too aggressive in marketing it to doctors who aren't qualified to use it, or who use it much more often than needed. The 15-minute procedure can net the doctor a profit as much as $250. Is this an example of innovation or waste?