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2 calculators
Screening and severity assessment tools for common psychiatric conditions encountered in primary care and specialist settings. The PHQ-9 screens for depression severity and monitors treatment response using nine DSM-aligned items. The GAD-7 assesses anxiety symptom burden over the preceding two weeks. Both are validated, freely available, and widely used in quality improvement and clinical research. The Epworth Sleepiness Scale and STOP-BANG questionnaire (also categorised under Sleep Medicine) screen for excessive daytime sleepiness and obstructive sleep apnoea risk respectively. These instruments are screening tools, not diagnostic tests — a positive screen warrants further clinical evaluation, and severity scores should be tracked longitudinally rather than interpreted in isolation.
Every tool in this domain is linked below, each with its own formula, inputs, and interpretation notes. Starting from the clinical area instead of the subject? The same calculators are grouped on the specialties pages, the full alphabetical list collects everything in one place, and the comparison tool lines up three tools side by side.
The PHQ-9 (Kroenke 2001) screens for and grades the severity of depressive symptoms over the prior two weeks. Nine DSM-based items are each scored 0–3 (total 0–27), with cut-points for minimal, mild, moderate, moderately severe, and severe depression; a score ≥ 10 has ~88% sensitivity and ~88% specificity for major depression. Item 9 screens for suicidal ideation and warrants urgent evaluation when endorsed.
General MedicineThe GAD-7 (Spitzer 2006) screens for and grades the severity of generalized anxiety symptoms over the prior two weeks. Seven items are each scored 0–3 (total 0–21), with a cut-point of 10 maximizing sensitivity (~89%) and specificity (~82%) for generalized anxiety disorder; scores fall into minimal, mild, moderate, and severe bands.
General Medicine