PHQ-9 Depression Test: The Gold Standard for Depression Screening

The PHQ-9 (Patient Health Questionnaire-9) is one of the most widely used self-report depression screening tools in the world. This article explores its origins, theoretical foundations, clinical meaning of each item, and how to properly interpret your results. Whether you are checking in on your emotional well-being or seeking a deeper understanding of depression, this guide will help you make sense of the PHQ-9. Free online test included.