Clinical Global Impressions — Severity (CGI-S)
Assessment tool
Rate the original Severity of Illness item.
Guy W. (1976), NIMH ECDEU Assessment Manual for Psychopharmacology; public-domain federal instrument.
Responses stay in this page’s memory. Reset or leave the page to clear them. No patient identifiers are collected.
About this scale and references
Reference information · Questionnaire
- Last content update
- 2026-10-26
- Clinical review
- Not independently reviewed
- Source jurisdiction
- See individual sources
- Coverage
- Questionnaire
| Field | Instrument context |
|---|---|
| Version | NIMH ECDEU 1976 original English; standalone CGI-S |
| Population | Patients evaluated by a clinician familiar with their history and clinical population |
| Respondent | Clinician-rated |
| Recall period | At this time |
| Purpose | Clinician global assessment; this rating is not a diagnosis |
Interpretation & limitations
- The result is the selected clinician rating; it is not inferred from another symptom total.
- Not assessed is a distinct non-result, not a zero-severity or zero-improvement score.
- This standalone item does not implement the CGI Efficacy Index or the other CGI component.
- Requires clinician judgment and clinical history. Do not use as a patient self-report questionnaire.
- No automated diagnosis, medication change or declaration of safety.
References · 3
- Guy (1976), ECDEU Assessment Manual, CGI form and guidance pp.217–222
- NIDA description of CGI ratings and required history
- CDISC public-domain status · Original NIMH federal-government instrument; CDISC identifies CGI as Public Domain.