Understanding PHQ-9: What the Depression Screening Score Really Means
The PHQ-9 is one of the most widely used depression screening tools in clinical practice. Here is what the score measures, what it does not measure, and how to use it well.
Rohy AI Clinical Content
Provider education and clinical insight
What the PHQ-9 actually measures
The Patient Health Questionnaire-9 is a nine-item self-report screening tool assessing depressive symptoms over the past two weeks. Each item maps to one of the nine DSM criteria for major depressive disorder.
Score ranges translate roughly to: 0-4 (minimal), 5-9 (mild), 10-14 (moderate), 15-19 (moderately severe), 20-27 (severe). These are population-derived thresholds — not diagnostic criteria.
The Rohy Difference
Ready for deeper self-awareness?
If this kind of reflection feels useful, Rohy helps you keep it going with structured prompts, mood tracking, and private journaling that evolves with you.
Start Free →What the PHQ-9 does not tell you
The PHQ-9 screens for symptom presence and frequency. It does not diagnose depression. Clinical diagnosis requires professional evaluation that considers duration, context, medical causes, and functional impairment.
Scores can also be affected by physical illness, medication side effects, or grief. A good clinician always contextualizes the score rather than treating it as a standalone verdict.
How to use PHQ-9 data well over time
The PHQ-9 is most valuable as a longitudinal trend tool, not a snapshot. A score that has climbed from 4 to 12 over six weeks tells you something important about trajectory that a single reading cannot.
Rohy AI includes PHQ-9 tracking as part of its longitudinal mental health dashboard, making trends visible over time. If you notice a sustained increase, bring that trend to your provider as part of a real conversation.
Related insights
Anxiety
What Is Emotional Regulation and Why Does It Break Down Under Stress
Understanding the mechanics of emotional regulation can help you regain control when life feels overwhelming. Explore the science of the "pause" and how to rebuild your resilience.
Depression
The Difference Between Sadness and Depression — And Why It Matters
Sadness is a human emotion; depression is a clinical state. Learn how to distinguish between the two and why accurate labeling is critical for your recovery.