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Printed on 7/20/2026
For informational purposes only. This is not medical advice.
PHQ-4 is an ultra-brief mental-health screener with two depression items and two anxiety items. It provides a total distress score plus subscale signals for anxiety and depression to support quick triage.
Formula: PHQ-4 total = Q1+Q2+Q3+Q4 (0-12); anxiety subscale = Q1+Q2; depression subscale = Q3+Q4.
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The patient rates 4 items on a 0-3 scale (Not at all / Several days / More than half the days / Nearly every day) about the past 2 weeks. The first 2 items are the GAD-2 anxiety items; the last 2 items are the PHQ-2 depression items.
Anxiety subscale (GAD-2): sum items 1+2, range 0-6. Depression subscale (PHQ-2): sum items 3+4, range 0-6. Total PHQ-4 score: sum all 4 items, range 0-12. No reverse scoring needed.
Anxiety subscale: score 3+ = positive anxiety screen (GAD). Depression subscale: score 3+ = positive depression screen (PHQ). Total PHQ-4 distress bands: 0-2 = normal; 3-5 = mild distress; 6-8 = moderate distress; 9-12 = severe distress. Positive subscale screens warrant full PHQ-9 and GAD-7 assessment.
Primary Care Providers
PHQ-4 enables simultaneous screening for both depression and anxiety in under 1 minute — the most time-efficient combined mental health screen available. It is ideal for primary care practices implementing universal annual mental health screening where PHQ-9 and GAD-7 would be too lengthy for routine administration at every visit.
Nurses and Medical Assistants
PHQ-4 can be administered by nurses or medical assistants during vital sign collection at annual wellness visits. A positive subscale score (3+) triggers automatic PHQ-9 and GAD-7 administration before the physician encounter, enabling efficient stepped-care screening without requiring physician time for initial screening.
Epidemiologists and Health Researchers
PHQ-4 is widely used in large-scale epidemiological surveys and population health research due to its brevity and validated subscale structure. It enables detection of both depression and anxiety prevalence with minimal respondent burden, making it suitable for community surveys, health registry data collection, and national health monitoring programs.
Telehealth Providers
PHQ-4 takes under 1 minute to complete and can be embedded in pre-visit patient questionnaires or administered verbally during telehealth visits. Its brevity ensures high completion rates even in remote settings. A positive screen triggers a full PHQ-9 or GAD-7 that can also be administered digitally before or during the same telehealth visit.
Obstetric Providers and Midwives
PHQ-4 provides rapid screening for both post-partum depression (PHQ-2 subscale) and post-partum anxiety (GAD-2 subscale) simultaneously at post-partum visits. Many practices use PHQ-4 at 2-week and 6-week post-partum check-ups, with positive screens triggering EPDS administration and clinical follow-up.
Community Health and Safety-Net Clinics
PHQ-4's 4-item format enables implementation in extremely high-volume clinical settings such as community health centers and urgent care clinics where traditional 9-item PHQ-9 administration is not feasible. PHQ-4 provides a valid triage layer that identifies the highest-priority patients for full mental health assessment.
PHQ-4 is the most time-efficient dual mental health screening tool available. It combines the PHQ-2 depression screen and GAD-2 anxiety screen into a single 4-item instrument. This makes it uniquely valuable in primary care settings where time is the primary barrier to mental health screening.
PHQ-4 is a triage instrument. A PHQ-2 subscale score of 3+ should trigger full PHQ-9 administration (9 items). A GAD-2 subscale score of 3+ should trigger full GAD-7 administration (7 items). Both can be triggered simultaneously if both subscales are positive. PHQ-4 is not designed to replace these more comprehensive assessments.
The PHQ-4 total distress score (0-12) is useful for global distress monitoring, but the individual subscale scores (depression PHQ-2 and anxiety GAD-2, each 0-6) are more clinically actionable. A patient with total PHQ-4 of 8 could have predominantly depression, predominantly anxiety, or equal severity of both — the subscales tell you which direction to pursue.
Kroenke et al. (2009) showed that PHQ-4 total scores of 6+ (moderate-severe distress range) correlate with significant functional impairment, disability days, healthcare utilization, and reduced quality of life. Patients scoring 6+ warrant immediate full assessment regardless of subscale pattern.
The PHQ-2 depression subscale captures the two core DSM-5 major depressive episode criteria: (1) depressed mood and (2) anhedonia (loss of interest or pleasure). These two items are sufficient to generate clinically relevant depression screening because the presence of either or both at threshold severity defines the diagnostic gateway criteria for major depression.
The GAD-2 items (feeling nervous/anxious/on edge, inability to stop or control worrying) are the two items with the highest factor loadings in GAD-7 and the two items most strongly associated with GAD diagnosis. Despite being only 2 items, GAD-2 achieves sensitivity 86% and specificity 83% for generalized anxiety disorder.
PHQ-4 is copyright-free and available from Pfizer in over 30 languages. It has been validated in primary care, obstetrics, and general population settings across multiple countries. This makes it an excellent global mental health screening tool for international clinical settings and multilingual patient populations.
PHQ-4 published by Kroenke, Spitzer, Williams and Lowe (Psychosomatics 2009) from 2149 adult primary care patients. PHQ-2 sensitivity 83%, specificity 92% for depression. GAD-2 sensitivity 86%, specificity 83% for anxiety. PHQ-4 total score 3-5 = mild distress, 6-8 = moderate, 9-12 = severe, with increasing functional impairment. Validated against SCID clinical interviews. PHQ-2: Kroenke et al. (Med Care 2003). GAD-2: Kroenke et al. (Ann Intern Med 2007). PHQ-9 and GAD-7 copyright-free from Pfizer.
Higher PHQ-4 totals indicate greater overall distress. Elevated subscales support targeted follow-up for anxiety and/or depression domains.
Use in high-throughput screening settings when an ultra-brief combined anxiety/depression triage tool is needed.
PHQ-4 is intentionally brief and non-diagnostic; positive results require fuller symptom and risk assessment.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
April 21, 2026 · trust-baseline
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