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Patient Health Questionnaire - 9 is a quick screening test for depression and anxiety.

Info bulb.pngAs a gesture towards quantitative measurement of the varying depths of depression, structured clinical questionnaires offer at least the appearance of objectivity.

PHQ-9 is evaluated for diagnosis of depression against the Gold standard of structured clinical interview. The usefulness where a doctor is available is therefore limited, but when training or clinical personnel is lacking, questionnaires may be useful as a screening aid. It would be a mistake to dismiss them as wholly unhelpful, but there is a risk that uncritical use and undue attention to them may reduce the accuracy and effectiveness of clinical evaluation, rather than improving it.

Available for use from under a suitable licence.