ASA Physical Status Classification — free guideline decision tool
ASA Physical Status classification for preoperative risk communication, from I (healthy) to VI (brain-dead donor).
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Physical status | I: Healthy, no systemic disease |
|---|---|
| Emergency surgery (add E) | Yes |
→ClassASA IE
- Note：Relatively low perioperative risk
| Physical status | VI: Brain-dead organ donor |
|---|---|
| Emergency surgery (add E) | No |
→ClassASA VI
- Note：High risk, needs multidisciplinary input and informed discussion
Common questions
What is ASA Physical Status Classification?
ASA Physical Status classification for preoperative risk communication, from I (healthy) to VI (brain-dead donor).
How is ASA Physical Status Classification calculated? What is the core formula?
ASA I healthy; II mild systemic disease; III severe but not incapacitating; IV severe, constant threat to life; V moribund; VI brain-dead donor; add 'E' for emergency procedures.
When is ASA Physical Status Classification used?
Use before surgery to assign a physical-status class and append 'E' for emergencies, supporting anesthetic risk discussion.
What are the key clinical points for ASA Physical Status Classification?
ASA class correlates with perioperative risk but is not the sole determinant — surgery type, anesthesia, and urgency also matter (original synthesis · not guideline verbatim). Assignment carries inter-rater subjectivity, especially for class II vs III. The 'E' modifier captures the added risk of emergency surgery independent of the underlying class.
What are the limits and cautions when using ASA Physical Status Classification?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
How is ASA Physical Status Classification calculated in practice? Can you show a worked example?
Inputs: Physical status I: Healthy, no systemic disease, Emergency surgery (add E) Yes → Result: Class ASA IE（Note: Relatively low perioperative risk） Inputs: Physical status VI: Brain-dead organ donor, Emergency surgery (add E) No → Result: Class ASA VI（Note: High risk, needs multidisciplinary input and informed discussion）
Run ASA Physical Status Classification now
ASA Physical Status classification for preoperative risk communication, from I (healthy) to VI (brain-dead donor).
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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