A new study pinpoints blood markers that can help diagnose depression in patients.
The test measures levels of nine RNA molecules, which are like DNA's squires that carry out its instructions.
Three of the nine markers remained the same even when the depressed patient went into remission, which might indicate that the person is more vulnerable to the disorder.
The test also showed the effects of cognitive behavioral therapy (CBT), a type of psychotherapy that gently reroutes your thoughts to more effectively deal with mental health issues.
Attempting to find a test like this isn't new to the field. The researchers write:
The search for an objective diagnostic test with high sensitivity and specificity for [major depressive disorder] has been ongoing for decades.