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The PHQ-2 (Patient Health Questionnaire-2) is an ultra-brief, validated two-item depression screening tool that assesses the two cardinal symptoms of major depression: anhedonia (loss of interest or pleasure) and depressed mood. As the shortest validated depression screener available, it takes less than 30 seconds to administer, making it ideal for busy clinical settings, annual wellness visits, and population-level screening programs.
The PHQ-2 was developed by Kroenke, Spitzer, and Williams as a first-step screening instrument within the PHQ system. The rationale is elegant: the two items correspond to the gateway criteria for major depressive disorder in the DSM-5. A diagnosis of MDD requires at least one of these two symptoms to be present. Therefore, if neither is present, major depression can be effectively ruled out.
At the standard cutoff of >=3, the PHQ-2 has a sensitivity of 83-97% and specificity of 67-92% for major depression across multiple validation studies. The high sensitivity makes it an excellent rule-out test — a negative PHQ-2 (score 0-2) has a negative predictive value exceeding 99% in typical primary care populations where depression prevalence is 5-10%. When the screen is positive (>=3), the full PHQ-9 should be administered for severity assessment.
The PHQ-2 has been endorsed by the USPSTF as an appropriate initial screening step and is integrated into many electronic health record systems for annual depression screening. It is also widely used in emergency departments, surgical pre-assessments, and obstetric care (alongside the EPDS for perinatal screening). Its brevity minimizes patient burden and clinician time, addressing a major barrier to routine mental health screening.
Each item is scored from 0-3 based on symptom frequency over the past two weeks: 0 = not at all, 1 = several days, 2 = more than half the days, 3 = nearly every day. Total scores range from 0-6. Like the PHQ-9, the PHQ-2 is in the public domain and free to use in any clinical or research setting.
Scoring is simple:
Total Score = Item 1 + Item 2 (range 0-6)
Standard Cutoff: >=3 = Positive Screen
The PHQ-2 is a screening tool only — a positive result indicates the need for further evaluation, not a diagnosis.
Recommendation 0 (Score 0): No current depressive symptoms. Routine rescreening per guidelines (annually in adults). Recommendation 1 (Score 1-2): Some depressive symptoms are present but below the screening threshold. While this does not constitute a positive screen, it may warrant clinical attention — ask about functional impairment, duration, and context. Rescreen in 2-4 weeks. Recommendation 2 (Score >=3): Positive depression screen. Administer the full PHQ-9 to assess severity and all nine depression criteria. If PHQ-9 confirms moderate-severe depression (>=10), initiate appropriate treatment. Always assess suicide risk when depression is identified.
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Score 1 = below threshold. Not a positive screen, but some anhedonia is present. Consider monitoring and rescreening.
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Score 4 = positive screen. Both cardinal symptoms present more than half the days. Administer full PHQ-9 for severity assessment.
The PHQ-2 is a 2-item depression screening questionnaire that assesses the two core symptoms of depression: anhedonia (loss of interest/pleasure) and depressed mood. It is the shortest validated depression screener, taking less than 30 seconds. It serves as a first-step screen before the full PHQ-9.
A PHQ-2 score of 3 or higher is considered a positive screen, meaning the patient may have major depression. However, it is not a diagnosis — it indicates the need for the full PHQ-9 questionnaire and clinical evaluation. About 50-80% of positive PHQ-2 screens are confirmed on further assessment.
At the cutoff of >=3, the PHQ-2 has sensitivity of 83-97% for major depression. This means it correctly identifies the vast majority of people with depression. Its strength is ruling out depression — a negative PHQ-2 has a >99% negative predictive value in primary care populations.
The PHQ-2 is ideal for: annual wellness visits, emergency department triage, pre-surgical screening, first-step screening in high-volume settings, and any situation where a brief depression screen is needed. If positive, always follow with the full PHQ-9 or a clinical interview.
The PHQ-2 uses only 2 items (anhedonia and depressed mood) as a quick screen. The PHQ-9 uses all 9 DSM-5 depression criteria and provides severity grading (0-27). The PHQ-2 is used to decide who needs the PHQ-9. The PHQ-9 guides treatment decisions and monitors response.
These two symptoms are the gateway criteria for major depressive disorder in the DSM-5. A diagnosis of MDD requires at least one of these to be present (plus 4 other symptoms for at least 2 weeks). By screening for these, the PHQ-2 captures the essential features that must be present for a diagnosis.
Yes, the false negative rate is 3-17%. Some patients with depression may not endorse anhedonia or depressed mood prominently (e.g., somatic presentations common in some cultures, masked depression in elderly). If clinical suspicion is high despite a negative PHQ-2, proceed with the full PHQ-9 or clinical interview.
The PHQ-2 has been validated in multiple languages and cultural settings, including US, European, Asian, African, and Latin American populations. However, the expression of depression varies culturally — some populations present more with somatic symptoms. Cross-cultural validation studies show maintained psychometric properties.
The USPSTF recommends screening all adults for depression at least annually. In high-risk populations (chronic illness, prior depression, perinatal period), more frequent screening every 3-6 months is appropriate. It should also be administered when clinical suspicion of depression arises.
Yes, the PHQ-2 is in the public domain. It was developed with public funding and is free to use without permission for clinical care, research, and education. It can be freely reproduced, incorporated into EHR systems, and translated without licensing fees.
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