Healthcare providers may screen patients in the general population for depression using a screening tool, such as the Patient Healthcare Questionnaire-2 (PHQ-2). If the PHQ-2 screening is positive for depression, a provider may then administer the PHQ-9. The Geriatric Depression Scale is a screening tool that can be used in the elderly population.
Major depressive episode
Major depressive disorder
Outline of bipolar disorder
Depression 
Late life depression
Atypical depression
Postpartum psychosis
Postpartum depression