Genetic testing does also provide guidance on whether an individual's MTHFR Gene allows for proper conversion of folate, which can be very helpful in determining which types of anti-depressants are likely to have the potential to "work."

The testing will not provide definitive answers, but can still be of use, especially for patients who are not getting relief from a drug or two that have been tried already. Each person has to decide (probably with the aid of a psychiatrist) if the tests are worthwhile.

Just my 2 cents.