The patient health questionnaire (PHQ) presented here is a 9-item scale and therefore is known as PHQ-9. This is a self-administered diagnostic tool for depression which has been well validated through clinical studies. It may not give you the confirmed diagnosis that you are suffering from depression. However, it will help you to understand if you require further medical help.
Read carefully and answer following 9 questions based on how you've been feeling during the last two weeks.