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Columbia - Suicide Severity Rating Scale (C-SSRS)
Please visit this website for more information about the instrument:
Core General CDE Recommendation for all diseases (this or a similar instrument for suicidal ideation)
Short Description of Instrument
The Columbia - Suicide Severity Rating Scale (C-SSRS) is a widely used instrument across research, clinical and institutional settings that was developed to assess suicidal ideation and behavior and is available in over 100 languages.
The Columbia - Suicide Severity Rating Scale (C-SSRS) was designed to provide a prospective, standardized measure of suicidality. The scale allows researchers to assess the severity of suicidal behaviors and ideations.
The C-SSRS supports suicide risk assessment through a series of simple, plain-language questions. Scale administrators ask a series of questions about suicidal thoughts and behaviors. The number and choice of questions are contingent on the answers received.  
Specific to Mitochondrial Disease: Depression has been reported in individuals with mitochondrial disorders. There have been no studies to validate the assessment in individuals with mitochondrial disorders.

There are two separate types of outcomes with codes for yes (1) and no (2) of each type of ideation or behavior. Higher scores indicate a higher level of suicidality.

Posner, K., Brent, D., Lucas, C., Gould, M., Stanley, B., Brown, G., Fisher, P., Zelazny, J., Burke, A., Oquendo, M. and Mann, J., 2008. Columbia-Suicide Severity Rating Scale (C-SSRS). New York, NY: The Research Foundation for Mental Hygene.
Posner K, Brown GK, Stanley B, Brent DA, Yershova KV, Oquendo MA, Currier GW, Melvin GA, Greenhill L, Shen S, Mann JJ. The Columbia-Suicide Severity Rating Scale: Initial Validity and Internal Consistency Findings from Three Multisite Studies with Adolescents and Adults. American Journal of Psychiatry. Online ahead of print Nov 8,2011.