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Patient Health Questionnaire (PHQ)-9 English
A depression diagnosis that warrants treatment or treatment change, needs at least one of the first two questions endorse as positive (little pleasure, feeling depressed) indicating the symptom has been present more than half the time in the past two weeks.
In addition the tenth question about difficulty at work or home or getting along with others should be answered at least "somewhat difficult".
Patient Health Questionnaire (PHQ)-2
The PHQ-2 inquires about the frequency of depressed mood and anhedonia over the past two weeks. The PHQ-2 includes the first two items of the PHQ-9.
The purose of the PHQ-2 is not to establish a final diagnosis or to monitor depression severity, but rather to screen for depression in a "first step" approach.
Patients who screen positive should be further evaluated with the PHQ-9 to determine whether they meet criteria for a depressive disorder.
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