GAD-2 Calculator

The Generalised Anxiety Disorder 2-item Scale (GAD-2) is an ultra-brief self-report screening tool for anxiety disorders. It consists of the first two items of the GAD-7, which assess the two core anxiety symptoms: feeling nervous, anxious, or on edge, and not being able to stop or control worrying. Developed by Kroenke, Spitzer, Williams, Monahan, and Löwe, the GAD-2 was published in 2007 in the Annals of Internal Medicine as a brief screening approach for anxiety disorders in primary care.

Each item is scored from 0 ("Not at all") to 3 ("Nearly every day"), producing a total score between 0 and 6. The GAD-2 can be completed in under one minute and serves as a rapid first-step screen for anxiety, with positive results typically followed by a more comprehensive assessment.

The GAD-2 was derived from the GAD-7 and validated in the same primary care population study. Kroenke and colleagues demonstrated that the two core worry items retained strong screening properties when used as a standalone instrument.

At a cut-off score of 3, the GAD-2 demonstrated a sensitivity of 86% and specificity of 83% for generalised anxiety disorder. It also showed moderate sensitivity for panic disorder (76%), social anxiety disorder (70%), and post-traumatic stress disorder (59%).

A 2016 systematic review and diagnostic meta-analysis by Plummer et al. in General Hospital Psychiatry confirmed the GAD-2's diagnostic accuracy across multiple populations and settings, supporting its use as a brief first-step screening tool for anxiety disorders.

The GAD-2 uses the same four-point Likert scale as the GAD-7:

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 an anxiety disorder 3-6: Positive screen — further evaluation with the GAD-7 or comprehensive clinical assessment recommended

A score of 3 is the most commonly used threshold for further evaluation. Like the PHQ-2, the GAD-2 is designed as a first-step screener rather than a severity measure. Individuals who screen positive should complete the full GAD-7 or undergo a comprehensive clinical assessment.

The GAD-2 is designed for rapid anxiety screening in time-pressured clinical environments. Its primary applications include:

Primary care settings where routine anxiety screening is recommended but the full GAD-7 may not be practical for every patient.

Emergency departments, where brief mental health screening can help identify individuals who may benefit from follow-up.

Stepped-care models, where the GAD-2 serves as the initial screening step before proceeding to the GAD-7 for severity assessment.

Combined screening when paired with the PHQ-2, providing a four-item combined depression and anxiety screen (the PHQ-4). This pairing allows rapid screening for the two most common mental health conditions in under two minutes.

The GAD-2 is not intended for severity measurement or treatment monitoring. For these purposes, the full GAD-7 is recommended.

In Australian healthcare, the GAD-2 is used as a rapid screening tool in general practice and community health settings. While the GAD-7 and K-10 are the primary instruments recommended under the Better Access initiative, the GAD-2 fills a practical role as a quick initial screen.

Australian clinicians may use the GAD-2 during routine consultations as an initial check for anxiety, with positive results leading to more comprehensive assessment. The instrument is particularly useful in busy general practice settings where time constraints make routine administration of longer instruments challenging.

The GAD-2 is frequently paired with the PHQ-2 to form the PHQ-4, providing a combined four-item screen for the two most prevalent mental health conditions in the Australian population.