2 published verifications about Major Depressive Disorder Major Depressive Disorder ×
“The Patient Health Questionnaire-9 (PHQ-9) assesses the core symptoms used to diagnose major depressive disorder and can be used to guide treatment planning.”
The evidence strongly supports this claim. The PHQ-9 was designed around the nine depressive symptom domains used in major depressive disorder diagnosis, and multiple clinical sources use its scores to inform severity assessment, monitoring, and treatment decisions. Its proper role is as a structured clinical aid, not a standalone replacement for full diagnostic evaluation.
“Scientific studies report an association between CYP2C19 genetic variants and major depressive disorder, longer depressive episodes, and greater depressive symptom severity.”
Published studies do report these associations. Systematic reviews and several primary studies describe links between CYP2C19 variants and depression risk, longer episodes, or greater symptom severity, even though results are mixed overall. The claim stays within what the evidence supports because it says studies report an association, not that the association is proven or universal.