C-SSRS

Posner K, Brown GK, Stanley B, et al. The Columbia-Suicide Severity Rating Scale: initial validity and internal consistency findings from three multisite studies with adolescents and adults. Established the C-SSRS ideation severity (1–5) and behaviour subscales, with good convergent and divergent validity and sensitivity to change.

The C-SSRS is endorsed by the US FDA, CDC and many health systems for systematic suicide-risk screening. The screener flags who needs a fuller assessment; it does not by itself determine disposition. Any positive behaviour item, or ideation item 4 or 5, warrants urgent mental-health evaluation and attention to means safety. Follow local safeguarding and mental-health pathways.