perhaps this overview will help you select the expected measurement tool among many used?
"A Systematic Review and Evaluation of Measures for Suicidal Ideation and Behaviors in Population-Based Research", Batterham, Philip J.; Ftanou, Maria; Pirkis, Jane; Brewer, Jacqueline L.; Mackinnon, Andrew J.; Beautrais, Annette; Fairweather-Schmidt, A. Kate; Christensen, Helen;Psychological Assessment, Vol 27(2), Jun 2015, 501-512
Can you give us more information about why you need to identify people thinking about suicide and what type of setting you would be working in?
I'm asking because some clinicians assume that patients must have had suicidal ideation in order to have suicidal behaviors. This allows them to reason that asking about the suicidal ideation will always highlight all patents that experience any type of suicidality. However, there have been many reports of patients experiencing suicidal behaviors without having had the suicidal ideation. If these patients are only asked about suicidal ideation then their suicidal behaviors will not be identified by only asking about suicidal ideation. For this reason and other potential issues like suicidal command hallucinations, I recommend a thorough full suicidality assessment scale, such as the InterSePT Scale for Suicidal Thinking - Plus (ISST-Plus) or the Sheehan - Suicidality Tracking Scale (S-STS). A study was published last year which validated these two scales against one another and against the Columbia-Suicide Severity Rating Scale.
Article Comparative Validation of the S-STS, the ISST-Plus, and the ...
Sorry, you were asking for a scale to use, so this answer will serve you better- it comes in an easy to use one page format.
Psy-World - Scale of Suicidal Ideation
www.psy-world.com/ssi.htm
Scale of suicidal ideation used to evaluate a patient's suicidal intentions. It can also be used to monitor a patient's response to interventions over time.
Items: 19
Responses: choice of 3 responses to each item
Points assigned to each choice, maximum 38 , indicative of severity.
1. Wish to live
moderate to strong
0
weak
1
none
2
2. Wish to die
none
0
weak
1
moderate to strong
2
3. Reasons for living/dying
for living outweigh for dying
0
about equal
1
for dying outweigh for living
2
4. Desire to make active suicide attempt
none
0
weak
1
moderate to strong
2
5. Passive suicidal desire
would take precautions to save life
0
would leave life/death to chance
1
would avoid steps necessary to save or maintain life
2
6. Duration of suicide ideation/ wish
brief fleeting periods
0
longer periods
1
continuous (chronic) or almost continuous
2
7. Frequency of suicide ideation
rare occasional
0
intermittent
1
persistent or continuous
2
8. Attitude toward ideation/wish
rejecting
0
ambivalent indifferent
1
accepting
2
9. Control over suicidal action/ acting-out wish
has sense of control
0
unsure of control
1
has no sense of control
2
10. Deterrents to active attempt
would not attempt because of a deterrent
0
some concern about deterrents
1
minimal or no concern about deterrents
2
11. Reason for contemplated attempt
to manipulate the environment; get attention or revenge
0
combination of desire to manipulate and to escape
1
escape surcease solve problems
2
12. Method: specificity or planning of contemplated attempt
not considered
0
considered but details not worked out
1
details worked out and well-formulated
2
13. Method: availability or opportunity for contemplated attempt
method not available or no opportunity
0
method would take time or effort; opportunity not readily available
1
method and opportunity available
2
future opportunity or availability of method anticipated
2
14. Sense of "capability" to carry out attempt
no courage too weak afraid incompetent
0
unsure of courage or competence
1
sure of competence courage
2
15. Expectancy/anticipation of actual attempt
no
0
uncertain not sure
1
yes
2
16. Actual preparation for contemplated attempt
none
0
partial
1
complete
2
17. Suicide note
none
0
started but not completed; only thought about
1
completed
2
18. Final acts in anticipation of death
none
0
thought about or made some arrangements
1
made definite plans or completed arrangements
2
19. Deception or concealment of contemplated suicide
revealed ideas openly
0
held back on revealing
1
attempted to deceive conceal or lie
2
Original references:
Beck AT Kovacs M Weissman A. Assessment of suicidal intention: The scale of suicide ideation. J Consult Clin Psychology. 1979; 47: 343-352.
Beck AT Steer RA Rantieri WF. Scale for suicide ideation: Psychometric properties of a self-report version. J Clin Psychology. 1988; 44: 499-505.
...and I recommend you read NIGHT FALLS FAST by Kay Redfield Jamison; DARKNESS VISIBLE by William Styron; THE STRANGER by Albert Camus; and THE BELL JAR by Sylvia Plath...
There is no ONE scale and the above great works about suicidality might help you identify what you are looking to measure
Although an ambitious undertaking, I recommend obtaining training in the MMPI-2/MMPI-2-RF. There is extensive empirical research linking several scales to increased risk of suicide. RCd (demoralization, hopelessness, helplessness), SUI (suicidal/death ideation), RC9 elevation (poor impulse control), BXD (behavioral/externalizing dysfunction) correlate with increased risk of suicide. I recommend Ben-Porath's "Interpreting the MMPI-2-RF", University of Minnesota Press (2012). It is an extremely rich resource. This has been invaluable in my private psychiatric practice.
Although an ambitious undertaking, I recommend obtaining training in the MMPI-2/MMPI-2-RF. There is extensive empirical research linking several scales to increased risk of suicide. RCd (demoralization, hopelessness, helplessness), SUI (suicidal/death ideation), RC9 elevation (poor impulse control), BXD (behavioral/externalizing dysfunction) correlate with increased risk of suicide. I recommend Ben-Porath's "Interpreting the MMPI-2-RF", University of Minnesota Press (2012). It is an extremely rich resource. This has been invaluable in my private psychiatric practice.
As an FYI, all versions of the Sheehan - Suicidality Tracking Scale (the standard, the Clinically Meaningful Change Measure, and the pediatric versions) and all of the related documents are now available from HarmResearch.org