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The test is supposed to tell which medication is best for a number of already diagnosed psychiatric disorders. It is NOT used to diagnose anything. However, when people have used the test and their doctors have prescribed the medication that GeneSight proposed, the patients have wound up back in psychiatric hospitals in far worse shape than they were on their original medication.
There has been no independent study of the test, only the hype from the manufacturer. The only studies have been very small ones paid for by the manufacturer.
Until there is more independent, peer-reviewed research published, it is best to avoid it.