New blood test may be able to find best antidepressant match, study says

British scientists took a major step toward bringing personalized medicine to mental health on Tuesday, announcing that they developed a blood test that can accurately predict whether you'll respond to the conventional, commonly prescribed antidepressants on the market.

This is important because about half of patients who try them don't respond to first-line antidepressants and often spend months struggling to find the right drug. Doctors also have not had a lot of tools to help them create more personalized individual treatment plans.