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MOOD & DEPRESSION · PHQ-9

How have you been feeling lately?

Nine questions about your mood, sleep, and energy over the past two weeks.

Explore the scientific background
Free test and resultsAbout 3 minutesAdult version · Ages 18 and older
Your answers stay in this tab.

Your test answers are not sent or saved. Reloading or leaving the page clears them. Optional email signup is separate.

Before you begin

Choose how often each problem has affected you over the past 14 days. An optional question about daily impact follows the nine questions; it does not change your score.

Questions use the published “English for the UK” form distributed by ECFS, without rewording, in a US English interface.

This questionnaire measures depressive symptoms. It cannot diagnose or rule out a condition on its own. The last question asks about thoughts of death or self-harm; support resources are available throughout.

RESEARCH WITH CONTEXT

What the science says

PHQ-9

Nine questions studied as a measure of depressive symptoms over the past two weeks.

The research

Kroenke, Spitzer, and Williams studied the PHQ-9 in 6,000 patients attending primary care and obstetrics-gynecology clinics. A subset had an independent clinical interview.

What the test explores

How often nine depressive symptoms occur. The score helps assess symptom severity alongside a clinical evaluation.

The version offered

Nine items from the unchanged “English for the UK” and “French for Belgium” forms distributed by ECFS. The additional daily impact question does not change the score. Reading aids are separate additions.

What to keep in mind. A score alone cannot confirm or rule out depression. Context, daily impact, and an assessment of the person’s safety matter.

Explore the research
  1. Kroenke, Spitzer & Williams · 2001 · Journal of General Internal MedicineThe PHQ-9: validity of a brief depression severity measure — opens in a new tab
  2. Authors’ manual · Scoring and terms of useInstructions for Patient Health Questionnaire (PHQ) and GAD-7 Measures — opens in a new tab
The questionnaire, its translation, and AI are separate questions.

The research cited concerns the instrument and the populations studied. It does not automatically validate every translation, this digital interface, or a future AI-enhanced analysis.

Sources and terms of use

Questions, choices, and the daily impact question use the PHQ-9 forms distributed by ECFS: “English for the UK” and “French for Belgium.” The wording is unchanged; the English interface uses US English. Reading aids and support messages are separate editorial additions. The library’s “France” link incorrectly opens a GAD-7 and was not used.

Developed by Drs. Robert L. Spitzer, Janet B.W. Williams, Kurt Kroenke and colleagues, with an educational grant from Pfizer Inc. No permission required to reproduce, translate, display or distribute.