Columbia Suicide Severity Rating

The Columbia Suicide Severity Rating Scale (C-SSRS) is a structured clinical interview developed by Dr. Kelly Posner and colleagues at Columbia University in 2007. It is considered the gold standard for assessing suicidal ideation and behavior in clinical, research, and community settings. Unlike simple screening tools that produce a single score, the C-SSRS provides a hierarchical classification of suicidal ideation severity (five levels from passive wish for death to active ideation with specific plan and intent) and suicidal behavior (four categories from preparatory acts to actual attempts), enabling clinicians to make nuanced risk assessments. The C-SSRS was developed through a collaboration between Columbia University, the University of Pennsylvania, and the University of Pittsburgh, funded by the National Institute of Mental Health. It has been adopted by the United States Food and Drug Administration as the recommended assessment for suicidality in all clinical trials, by the Centers for Disease Control and Prevention for suicide surveillance, by the Department of Defense and Veterans Affairs for military and veteran populations, and by the Joint Commission as a recommended tool for healthcare accreditation. The scale distinguishes between suicidal ideation (thoughts about suicide) and suicidal behavior (actions taken toward suicide), a distinction that is critical for risk assessment and intervention planning. Suicidal ideation is rated on a 5-point ordinal scale: (1) wish to be dead, (2) non-specific active suicidal thoughts, (3) active suicidal ideation with any methods (not plan) without intent to act, (4) active suicidal ideation with some intent to act without specific plan, and (5) active suicidal ideation with specific plan and intent. Suicidal behavior is categorized as: actual attempt, interrupted attempt, aborted attempt, or preparatory acts or behavior. The C-SSRS is available in multiple versions including the full lifetime/recent version, the since-last-visit version for longitudinal monitoring, and the screener version for rapid community and clinical screening. All versions are available at no cost from the Columbia Lighthouse Project, which provides free training and implementation resources.

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1. 1Select the Appropriate C-SSRS Version: Choose the version appropriate for the clinical context. The Lifetime/Recent version assesses both lifetime history and a recent period (typically the past month) and is used for initial comprehensive assessments. The Since Last Visit version assesses ideation and behavior since the last clinical contact and is used for longitudinal monitoring in ongoing treatment. The Screener version contains only the ideation questions and is used for rapid screening in emergency departments, primary care, schools, and community settings. The Pediatric version uses simplified language for children aged 6 to 11. All versions are freely available through the Columbia Lighthouse Project.
2. 2Assess Suicidal Ideation Using the Hierarchical Questions: Begin with the lowest severity level and progress upward. Ask question 1: 'Have you wished you were dead or wished you could go to sleep and not wake up?' If yes, proceed to question 2: 'Have you actually had any thoughts of killing yourself?' If yes, proceed to question 3: 'Have you been thinking about how you might do this?' If yes, proceed to question 4: 'Have you had these thoughts and had some intention of acting on them?' If yes, proceed to question 5: 'Have you started to work out or worked out the details of how to kill yourself, and do you intend to carry out this plan?' Record the highest level endorsed. If the patient denies ideation at any level, do not proceed to higher levels.
3. 3Assess Ideation Intensity for the Highest Endorsed Level: For the highest ideation level endorsed, assess five intensity dimensions. Frequency: how often the thoughts occur (1 = less than once a week to 5 = many times every day). Duration: how long the thoughts last (1 = fleeting seconds to 5 = persistent continuous). Controllability: ability to stop or redirect the thoughts (1 = easily able to control to 5 = unable to control). Deterrents: whether anything prevents acting on the thoughts (1 = deterrents definitely stop from acting to 5 = deterrents do not apply). Reasons for ideation: the motivation behind the thoughts (1 = completely to get attention to 5 = completely to end or stop the pain). Sum these five ratings for the intensity score (range 5-25).
4. 4Assess Suicidal Behavior: Independently from ideation, assess whether any suicidal behavior has occurred during the assessment period. An actual attempt is a potentially self-injurious act committed with at least some wish to die. An interrupted attempt is an act that was stopped by an outside circumstance before any self-harm occurred. An aborted attempt is an act that the individual stopped before any self-harm occurred. Preparatory acts include gathering pills, obtaining a weapon, writing a suicide note, or giving away possessions. For each behavior endorsed, record the date, method, medical severity of any injury, and the circumstances. Distinguish suicidal behavior from non-suicidal self-injury, which is self-harm without intent to die.
5. 5Assess Medical Lethality of Any Attempts: For any actual suicide attempts, rate the medical severity: 0 = no physical damage, 1 = minor physical damage (superficial scratching), 2 = minor physical damage (bruising, sprains), 3 = moderate physical damage (requiring medical attention), 4 = moderately severe physical damage (requiring hospitalization), 5 = severe physical damage (intensive care required), 6 = death. Also assess the potential lethality: what would have happened without medical intervention. This rating is crucial because a patient who took a lethal overdose but was discovered quickly may have minimal actual injury (low medical severity) but extremely high potential lethality.
6. 6Determine the Overall Risk Level: Synthesize the ideation severity, intensity, behavior, and clinical context to determine overall risk level. Low risk: Level 1-2 ideation, low intensity, no behavior, strong protective factors. Moderate risk: Level 3 ideation, moderate intensity, no recent behavior, some protective factors. High risk: Level 4-5 ideation, high intensity, recent behavior (within past 3 months), weak protective factors. Imminent risk: Level 5 ideation with high intensity and low controllability, or recent actual attempt, or current preparatory behavior. The risk level directly informs the disposition decision: outpatient follow-up, urgent psychiatric evaluation, or emergency hospitalization.
7. 7Implement Risk-Appropriate Safety Interventions: Based on the risk level, implement appropriate interventions. For low risk: safety planning, means restriction counseling, follow-up appointment within one week. For moderate risk: comprehensive safety plan, means restriction, follow-up within 48 to 72 hours, consider increasing treatment intensity. For high risk: psychiatric evaluation for possible hospitalization, crisis safety plan, means restriction, continuous monitoring until evaluation completed. For imminent risk: do not leave patient alone, initiate emergency psychiatric evaluation, implement one-to-one observation, prepare for possible involuntary hospitalization if patient refuses voluntary admission. Document the C-SSRS results, risk formulation, and intervention plan in the medical record.

• !Confusing Suicidal Ideation with Suicidal Behavior: The C-SSRS deliberately separates ideation (thoughts) from behavior (actions), and this distinction has critical clinical implications. Ideation and behavior do not always progress in a linear fashion. Some individuals act on suicidal impulses with minimal prior ideation, while others experience chronic intense ideation without ever acting. Clinicians sometimes treat all suicidal ideation as requiring the same intervention as suicidal behavior, leading to unnecessary hospitalization for patients with chronic passive ideation. Conversely, they may underestimate the risk of patients who report low ideation but have engaged in preparatory behavior. Always assess both domains independently.
• !Relying on the C-SSRS Score Alone Without Clinical Context: The C-SSRS provides structured data about ideation and behavior, but risk assessment requires integrating this data with clinical context. Factors that modify risk include: prior attempt history (the single strongest predictor of future attempts), access to lethal means (particularly firearms), recent major loss or psychosocial stressor, substance intoxication or use disorder, psychiatric diagnosis (especially psychotic disorders, borderline personality disorder, and bipolar disorder), recent discharge from psychiatric hospitalization, chronic pain or terminal illness, social isolation, and demographic risk factors. A patient with Level 2 ideation but multiple high-risk contextual factors may be at greater risk than a patient with Level 4 ideation and strong protective factors.
• !Failing to Reassess After Initial Screening: Suicidal risk is dynamic and fluctuates over hours, days, and weeks. A negative C-SSRS screening at a Monday clinic visit does not guarantee safety through the following weekend. Common reassessment triggers include: medication changes (especially SSRI initiation in young adults), psychosocial stressors (relationship breakup, job loss, legal problems), substance relapse, discharge from inpatient care (the weeks following discharge carry the highest suicide risk), anniversaries of losses, and clinical deterioration. The Since Last Visit version of the C-SSRS is designed for serial reassessment and should be administered at every clinical contact for patients with identified suicide risk.