C-SSRS Scoring · Columbia Suicide Severity Rating Scale

The C-SSRS (Columbia-Suicide Severity Rating Scale) is a clinician-administered interview that quantifies the severity of suicidal ideation and behaviour ¹. Risk is set by the highest item endorsed, not by a total score.

Why was the C-SSRS developed?

Research on suicide prevention needed a standard method for assessing both suicidal ideation and behaviour, to identify those at risk and to track treatment response. The C-SSRS was designed to meet that need, and its first validation found it suitable for clinical and research settings ¹.

The C-SSRS tracks suicidal ideation and behaviour over time, giving a standardized way to monitor clinical change during high-risk periods. When a brief depression screen such as the PHQ-9 flags item 9 (thoughts of self-harm), the C-SSRS is a common follow-up for full risk stratification.

What does the C-SSRS measure?

The C-SSRS measures the full spectrum of suicidal ideation and behaviour:

1. Ideation severity (Items 1–5): ranges from "wish to be dead" to "active ideation with specific plan and intent."
2. Ideation intensity: frequency, duration, controllability, deterrents, and reasons for ideation.
3. Suicidal behaviour: actual attempts, interrupted attempts, aborted attempts, and preparatory acts.
4. Lethality: actual medical damage from attempts.

How do you give the C-SSRS?

• Interviewer: requires administration by a trained interviewer; not a self-report tool.
• Time: the Screener version is brief; the full version takes longer when ideation or behaviour is present.
• Age: validated in adolescents and adults ¹; separate pediatric versions are available.
• Asking directly: a review found no study showing a significant increase in suicidal ideation when people were asked about suicidal thoughts; talking about suicide may reduce rather than increase it ³.

How do you score and interpret the C-SSRS?

The C-SSRS stratifies risk based on endorsed items:

• Low risk: wish to be dead or passive ideation without method, intent or plan (Items 1–2).
• Moderate risk: active ideation with method, but no specific plan or intent (Item 3).
• High risk: suicidal ideation with specific plan or intent (Items 4–5), or recent preparatory behaviour or attempts.

Critical action: any "Yes" response to items 4 or 5, or any recent suicidal behaviour, requires immediate safety intervention and clinical escalation.

The C-SSRS is a clinical interview, not a summed numeric scale: risk is determined by the highest endorsed item, not a total score. In the validation study, people at the two highest ideation levels (intent, or intent with plan) at baseline had higher odds of a later attempt ¹.

The C-SSRS screener (screen version)

The screener is the shortest form of the Columbia Protocol, condensed to a minimum of two and a maximum of six questions depending on the answers ⁴. The full scale is used for a more thorough assessment. The questions are not reproduced here; the Columbia Lighthouse Project publishes them free of charge for community and healthcare settings ⁴.

How the community screener is structured ⁵:

Columbia notes that each organization can set its own criteria for next steps, and it supplies example triage documents for that purpose ⁴. The low, moderate and high risk table above follows the same logic: the highest endorsed item, and how recently it occurred, drive the response. A positive screener leads to the full C-SSRS or a clinical risk assessment and safety planning; the screener alone is not a full risk formulation.

When risk is high

High risk requires immediate action:

• Do not leave the client alone.
• Call or text 988 (the Suicide & Crisis Lifeline in the US and Canada), contact emergency services (911), or arrange transport to an emergency department.
• Complete safety planning, restrict access to means, and engage the client's support system.
• Document all interventions.

See crisis resources.

Documenting C-SSRS results

C-SSRS ideation type and intensity belong in the Objective section of a note; risk level and the safety plan belong in the Assessment and Plan sections. See the SOAP notes guide.

Psychometric properties

The first validation examined the C-SSRS in three multisite studies ¹:

• Samples: adolescent suicide attempters (N = 124), depressed adolescents in a medication trial (N = 312), and adults presenting to an emergency department for psychiatric reasons (N = 237).
• Validity: good convergent and divergent validity with other suicidal ideation and behaviour scales, and high sensitivity and specificity for suicidal behaviour classifications.
• Sensitivity to change: both the ideation and behaviour subscales were sensitive to change over time.
• Internal consistency: the intensity of ideation subscale showed moderate to strong internal consistency.
• Prediction: among adolescent attempters, worst-point lifetime ideation on the C-SSRS predicted suicide attempts during the study.

Limitations

• Does not replace clinical judgment or the need for a comprehensive safety plan.
• Reliant on the respondent's honesty and the interviewer's rapport-building.
• Risk levels are set by the highest endorsed item; the C-SSRS has no summed total score or published numeric cutoffs.
• In a small exploratory study of 40 people, the C-SSRS disagreed with two other standardized scales on several FDA 2012 suicidality categories, including some active ideation categories and aborted and interrupted attempts, raising questions about how well it maps to those categories ².

How does the C-SSRS compare with other suicide risk screens?

Other validated suicide risk screens include the ASQ (Ask Suicide-Screening Questions), the P4 Screener and the SBQ-R (Suicide Behaviors Questionnaire-Revised).

Use the C-SSRS when you need:

• detailed risk stratification
• to track suicidality over time (measurement-based care)
• an assessment for emergency or crisis settings
• structured clinical documentation

Consider alternatives when:

• ASQ: pediatric medical settings, very brief screening
• P4: you want to integrate clinical judgment and assess protective factors
• SBQ-R: research settings, population screening

All suicide risk assessments should be followed by a clinical interview and safety planning when risk is identified. No screening tool replaces clinical judgment.

If you or someone you know is in crisis, please reach out promptly. Help is available 24/7.