Patient Health Questionnaire 9

The Patient Health Questionnaire-9 (PHQ-9) was initially designed to facilitate the recognition and diagnosis of depressive disorders in primary care. It is now widely used both as a screening measure for depression across treatment settings, and as a progress monitoring tool for depression treatment.

Total number of questions


Administration method


Standardized cadence

Every 2 weeks

Age range



English and Spanish

Scoring and interpretation

Reliability and validity

PHQ-9 scores > 10 had a sensitivity of 88% and a specificity of 88% for Major Depressive Disorder. A study involving two different patient populations produced Cronbach alphas of .86 and .89.

Additional information

Different versions of the PHQ-9 are available, including a version for adolescents (PHQ-A), a version omitting suicide-related questions (PHQ-8), and a version translated to Spanish (PHQ-9 Spanish).

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