A study published earlier this year in the American Journal of Medical Genetics suggests that lymphoblast gene expression may be used to identify biomarkers for panic disorder. Researchers at the University of Iowa evaluated gene expression profiles in lymphoblasts (immature white blood cells) cultured from patients with and without panic disorder and found specific disorder- and sex-related differences [1]. A blood test for panic disorder and other mental health conditions based on the study results is being developed. However, a commercial diagnostic test may be premature as the study results are far from conclusive.