PHQ-2 Calculator

The Patient Health Questionnaire-2 (PHQ-2) is an ultra-brief two-item self-report screening tool for depression. It consists of the first two items of the PHQ-9, which assess the two core symptoms of major depressive disorder: depressed mood and anhedonia (loss of interest or pleasure). Developed by Drs Kurt Kroenke, Robert L. Spitzer, and Janet B.W. Williams, the PHQ-2 was designed as a first-step screening instrument to identify individuals who may benefit from more comprehensive depression assessment.

Each item is scored from 0 ("Not at all") to 3 ("Nearly every day"), yielding a total score between 0 and 6. The PHQ-2 can be administered in under one minute, making it one of the briefest validated depression screening measures available. Like its parent instrument the PHQ-9, the PHQ-2 is freely available in the public domain.

The PHQ-2 was derived from the PHQ-9 and validated by Kroenke, Spitzer, and Williams in a study published in Medical Care in 2003. The rationale for the two-item version was that depressed mood and anhedonia are the two cardinal symptoms of major depressive disorder, and their presence is a prerequisite for diagnosis under DSM criteria.

In the original validation study, a PHQ-2 score of 3 or above had a sensitivity of 83% and specificity of 92% for major depressive disorder. The instrument demonstrated strong operating characteristics as a case-finding tool, with a positive likelihood ratio of approximately 10 at the threshold of 3.

Subsequent validation studies have confirmed these properties across diverse populations, including primary care patients, medical inpatients, and community samples. The PHQ-2 performs well as a rapid screening step, with positive screens typically followed by administration of the full PHQ-9 or another comprehensive measure.

The PHQ-2 uses the same four-point Likert scale as the PHQ-9. Each of the two items is rated:

0 = Not at all 1 = Several days 2 = More than half the days 3 = Nearly every day

Total scores range from 0 to 6. The published scoring interpretation is:

0-2: Below screening threshold — low likelihood of a depressive disorder 3-6: Positive screen — further evaluation with the PHQ-9 or comprehensive clinical assessment recommended

A score of 3 is the most commonly used threshold for further evaluation. The PHQ-2 is intended as a first-step screener, not a severity measure or diagnostic tool. Individuals who screen positive should complete the full PHQ-9 or undergo a comprehensive clinical interview.

The PHQ-2 is designed for settings where time is limited and a very brief initial screen for depression is needed. Common applications include:

Emergency departments and urgent care, where rapid screening supports identification of individuals who may benefit from follow-up.

Annual health checks and wellness visits, where routine depression screening is recommended but comprehensive instruments may be impractical.

Population health surveys and large-scale screening programs, where brevity is essential.

Stepped-care models, where the PHQ-2 serves as the first step, with positive screens proceeding to the full PHQ-9 for severity assessment and monitoring.

The PHQ-2 is not intended for severity measurement or treatment monitoring. For these purposes, the full PHQ-9 is recommended.

In Australian healthcare, the PHQ-2 is used as a rapid screening tool in general practice, emergency departments, and community health settings. While the PHQ-9 and K-10 are the primary instruments recommended under the Better Access to Mental Health Care initiative, the PHQ-2 fills a practical role as an initial screening step in time-pressured environments.

Australian GPs may use the PHQ-2 during routine consultations as an initial check, with positive results leading to more comprehensive assessment using the PHQ-9 or clinical interview. The instrument is also used in Australian research as a brief measure of depressive symptoms in population studies.

The PHQ-2's simplicity and public domain status make it accessible across all Australian healthcare settings without cost barriers.