In mental health assessments, what is the purpose of the PHQ-9 questionnaire?

The PHQ-9 questionnaire serves a specific purpose in mental health assessments by screening for the severity of depression. It is a widely recognized tool that consists of nine questions based on the diagnostic criteria for major depressive disorder. The responses are scored to determine the level of depression, which can guide treatment decisions and help monitor treatment outcomes over time.

By focusing on symptoms such as mood, interest, energy, and functionality, the PHQ-9 provides valuable insights into how a patient is feeling and functioning daily. This structured approach facilitates the early identification of depression, enabling healthcare providers to intervene promptly and tailor appropriate interventions based on the severity of the symptoms reported.