Instrument: Patient Health Questionnaire-9 (PHQ-9)


The Patient Health Questionnaire (PHQ) is a self-administered version of the PRIME-MD tool for common mental health disorders administered by health care professionals. This examination addresses 12 different mental health disorders.

The PHQ-9 is a diagnostic tool that is specific to depression. The PHQ contains modules on 12 different mental health disorders including mood, anxiety, and some of the sleep disorder modules. This tool assesses the 15 most common physical symptoms in primary care. A shorter, alternative version of the PHQ, called the Brief PHQ, assesses depression, anxiety, psychological stressors, and women's reproductive health. This scale simply scores each of the 9 Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) criteria based on the mood module from the original PRIME-MD.

Developed by Drs. R.L. Spitzer, J.B.W. Williams, K. Kroenke and colleagues, with an educational grant from Pfizer, Inc. No permission required to reproduce, translate, display or distribute.

Instrument Usage: 
Clinical Research

Lowe B, et al. Monitoring depression-treatment outcomes with the Patient Health Questionnaire-9 (PHQ-9). Med Care, 42, 1194-1201, 2004.

Sample Form: 
ModuleModule ID
Patient Health Questionnaire-9 (PHQ-9)4147806