Patient Health Questionnaire

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The PHQ-9 is a multipurpose instrument for screening, diagnosing, monitoring and measuring the severity of depression.
The PHQ-9 incorporates DSM-IV depression diagnostic criteria with other leading major depressive symptoms into a brief self-report tool.
The tool rates the frequency of the symptoms which factors into the scoring severity index.
Question 9 on the PHQ-9 screens for the presence and duration of suicide ideation.
A follow up, non-scored question on the PHQ-9 screen and assigns weight to the degree to which depressive problems have affected the patient's level of function.