C-SSRS
The Columbia Suicide Severity Rating Scale (C-SSRS) is the most widely used measure of suicidal ideation and behavior. It assesses both the severity and intensity of ideation and tracks suicidal behaviors over a defined period.
What the C-SSRS measures
The C-SSRS uses plain-language questions to assess a person's suicidal ideation (from a passive wish to active intent with a plan) and any suicidal behaviors. It produces a structured picture of risk rather than a single number, which is why it's used across emergency, primary-care, and behavioral-health settings.
Who it's for
Adults and adolescents. Versions include the full scale, a brief Screener, and a Risk Triage form for rapid use.
Scoring
The C-SSRS is interpreted by the pattern of responses — which ideation and behavior questions are endorsed — rather than a summed total. A “yes” on higher-risk items signals the need for immediate clinical attention.
How to access the C-SSRS
The C-SSRS is made available for clinical and research use through The Columbia Lighthouse Project, which provides the official forms and training. Because licensing terms vary by setting, confirm the current terms with the Columbia Lighthouse Project before using it in any product or service. The instrument's items are not reproduced here.
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What does the C-SSRS measure?
The C-SSRS measures suicidal ideation and behavior — the severity and intensity of ideation and the presence of suicidal behaviors — to help clinicians assess risk.
Is the C-SSRS free to use?
The C-SSRS is made available for clinical and research use through The Columbia Lighthouse Project. Licensing terms vary by setting, so confirm the current terms before using it in a product or service.
In crisis? Call or text 988 (Suicide & Crisis Lifeline, US) — free, confidential, 24/7. This page is educational and is not a diagnostic tool or a substitute for professional evaluation.