A blood test for suicide?

Johns Hopkins researchers say they have discovered a chemical alteration in a single human gene linked to stress reactions that, if confirmed in larger studies, could give doctors a simple blood test to reliably predict a person's risk of attempting suicide.

Identification and Replication of a Combined Epigenetic and Genetic Biomarker Predicting Suicide and Suicidal BehaviorsThe American Journal of Psychiatry.

Would this have helped Karen? When would such test be done? What happens when the results are positive? What happens when the results are a false positive? What happens when the results are negative and there is a suicide? Paper is behind a paywall so a trip to the library is required to get those answers, if they are answered in the paper.

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