New York patients may be dismayed to find out that many of the medical tests performed each year in the United States are not reviewed and approved by the Food and Drug Administration. A 1988 law gives the FDA authority to review only tests that are sold to multiple labs, which allows thousands of tests to be performed each year that have not been required to undergo any kind of official scrutiny. The FDA also points out that only about 1 percent of the nation’s approximately 180,000 medical labs have ever been inspected.