Blood test can diagnose major depression in teens

A scientist has developed the first blood test to diagnose major depression in teens, which could also lead to a more personalised course of treatment and reduce the stigma associated with depression.

The estimated rates of major depressive disorder jump from 2 to 4 percent in pre-adolescent children to 10 to 20 percent by late adolescence. Early onset of major depression in teens has a poorer prognosis than when it starts in adulthood. Untreated teens with this disease experience increases in substance abuse, social maladjustment, physical illness and suicide. Their normal development is derailed, and the disease persists into adulthood.

Current difficulties in diagnosing teenage depression

Blood test for depression

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The current method of diagnosing depression is subjective. It relies on the patient’s ability to recount his symptoms and the physician’s ability and training to interpret them.

Diagnosing teens is an urgent concern because they are highly vulnerable to depression and difficult to accurately diagnose due to normal mood changes during this age period.

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Blood test provides more accurate diagnosis and treatment

The blood test works by measuring a specific set of genetic markers found in a patient’s blood. It is also the first test that can distinguish between teens with major depression and those with major depression combined with anxiety disorder. This is the first evidence that it’s possible to diagnose subtypes of depression from blood, raising the hope for tailoring care to the different types.

“Depression is treated with a blunt instrument. It’s like treating type 1 diabetes and type 2 diabetes exactly the same way. We need to do better for these kids.”

“Right now depression is treated with a blunt instrument,” said Eva Redei, a professor of psychiatry and behavioral sciences at Northwestern University Feinberg School of Medicine and lead investigator of the study, published in Translational Psychiatry. “It’s like treating type 1 diabetes and type 2 diabetes exactly the same way. We need to do better for these kids.”

“This is the first significant step for us to understand which treatment will be most effective for an individual patient. Without an objective diagnosis, it’s very difficult to make that assessment. The early diagnosis and specific classification of early major depression could lead to a larger repertoire of more effective treatments and enhanced individualised care.”

[RELATED: Helping anxious teens focus on the positive]

De-stigmatising depression

But the test is only one part of the solution for helping teens with depression. Further indicating the challenge in working with depressed adolescents, none of the teens who were diagnosed with depression opted for treatment.

“Everybody, including parents, are wary of treatment, and there remains a social stigma around depression, which in the peer-pressured world of teenagers is even more devastating,” says Professor Redei. “Once you can objectively diagnose depression as you would hypertension or diabetes, the stigma will likely disappear.”

The results of this study were published in Translational Psychiatry




  1. This is a major breakthrough, not only for the diagnosing of teenage depression but potentially for diagnosing the other types of depression. So many people including doctors think teenage depression isn’t real or is just part of being a teenager. The less subjective it is to make a diagnosis the more teenagers who can get help. Being a teenager is hard enough without having to deal with depression. So many teenagers and the adults around them don’t recognize the signs of depression until it’s too late. This test could really make a difference and save lives.
    Ellen Dyson recently posted..Teenage DepressionMy Profile

  2. Thekids says:

    Thanks for your comment Ellen. Yes, I can really see how it might help destigmatize it for teens.



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