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SNAP-IV

Name: SNAP-IV Calculator Online: ADHD and ODD Screening Tool
Creator: MedicPulse

SNAP-IV Assessment System for ADHD and ODD

neurology

FOR PROFESSIONAL USE ONLY

This calculator is a support tool intended exclusively for health professionals. It does not replace clinical judgment. The final decision regarding diagnosis and treatment is the sole responsibility of the professional.

Patient Data

1. Fails to give close attention to details or makes careless mistakes in schoolwork or tasks

2. Has difficulty sustaining attention in tasks or play activities

3. Does not seem to listen when spoken to directly

4. Does not follow through on instructions and fails to finish schoolwork, chores, or duties

5. Has difficulty organizing tasks and activities

6. Avoids, dislikes, or is reluctant to engage in tasks that require sustained mental effort

7. Loses things necessary for activities (toys, homework, pencils, or books)

8. Is easily distracted by extraneous stimuli

9. Is forgetful in daily activities

10. Fidgets with hands or feet or squirms in seat

11. Leaves seat in classroom or in other situations in which remaining seated is expected

12. Runs about or climbs excessively in situations in which it is inappropriate

13. Has difficulty playing or engaging in leisure activities quietly

14. Is often 'on the go' or often acts as if 'driven by a motor'

15. Talks excessively

16. Blurts out answers before questions have been completed

17. Has difficulty awaiting turn

18. Interrupts or intrudes on others

19. Loses temper

20. Argues with adults

21. Actively defies or refuses to comply with adults' requests or rules

22. Deliberately annoys others

23. Blames others for his or her mistakes or misbehavior

24. Is touchy or easily annoyed by others

25. Is angry and resentful

26. Is spiteful or vindictive

About this Calculator 💡

The SNAP-IV, an acronym for "Swanson, Nolan, and Pelham, version IV," is a standardized and widely used rating scale designed specifically to assess the presence and severity of symptoms of Attention-Deficit/Hyperactivity Disorder (ADHD) and Oppositional Defiant Disorder (ODD) in children and adolescents, typically in the 6-18 age range. This tool is not a test administered to the child, but rather a questionnaire completed by informants who observe the child in different settings, most commonly parents (or caregivers) and teachers. The scale is based directly on the diagnostic criteria from the DSM-IV (Diagnostic and Statistical Manual of Mental Disorders, 4th Edition). The most common version of the SNAP-IV is the 26-item scale, which is divided into three subscales: 9 items assessing symptoms of Inattention (ADHD-Inattentive criteria), 9 items assessing symptoms of Hyperactivity and Impulsivity (ADHD-Hyperactive/Impulsive criteria), and 8 items assessing symptoms of Oppositional Defiant Disorder. Each item describes a specific behavior (e.g., "Fidgets with hands or feet or squirms in seat"), and the informant (parent or teacher) rates the frequency of this behavior on a 4-point scale

Reference Values

•ADHD - Inattention
•0-17: Inattention symptoms below the clinical threshold
•18-27: Inattention symptoms suggestive of ADHD
•
•ADHD - Hyperactivity/Impulsivity
•0-17: Hyperactivity/impulsivity symptoms below the clinical threshold
•18-27: Hyperactivity/impulsivity symptoms suggestive of ADHD
•
•ODD - Oppositional Defiant Disorder
•0-11: ODD symptoms below the clinical threshold
•12-24: Symptoms suggestive of Oppositional Defiant Disorder

Formula

Calculation Methodology Sum the points for each domain separately. For ADHD: 6 or more symptoms with a score ≥2 in any domain. For ODD: 4 or more symptoms with a score ≥2.

Reference

Swanson, J. M. (1992). School-based Assessments and Interventions for ADD Students. Irvine, CA: KC Publishing.
Swanson JM, Kraemer HC, Hinshaw SP, Arnold LE, Conners CK, Abikoff HB, Clevenger W, Davies M, Elliott GR, Greenhill LL, Hechtman L, Hoza B, Jensen PS, March JS, Newcorn JH, Owens EB, Pelham WE, Schiller E, Severe JB, Simpson S, Vitiello B, Wells K, Wigal T, Wu M. Clinical relevance of the primary findings of the MTA: success rates based on severity of ADHD and ODD symptoms at the end of treatment. J Am Acad Child Adolesc Psychiatry. 2001 Feb;40(2):168-79. doi: 10.1097/00004583-200102000-00011. PMID: 11211365.