There's a new tool for spotting major depression in teens. A researcher at Northwestern University in Illinois says she has developed the first blood test to diagnose the condition. It measures a set of genetic markers and points out two kinds of depression. The scientist who worked on the blood test says it's an objective way to find major depression as well as depression that's linked to anxiety.

The new test is an effort to improve the rate of diagnosis of the condition and to provide treatment that's tailored to the type of depression. Depression in teens can be tough to diagnose because young people have normal mood swings during adolescence. Results of the study are published in the journal "Translational Psychiatry."

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