Postoperative Nausea & Vomiting Risk (Apfel simplified score) — free guideline decision tool
The Apfel simplified score predicts postoperative nausea and vomiting (PONV) after general anesthesia from four risk factors, guiding the intensity of antiemetic prophylaxis.
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.
| Female | No (0) |
|---|---|
| Non-smoker | No (smoker, 0) |
| History of PONV or motion sickness | No (0) |
| Postoperative opioid use | No (0) |
→Apfel0(0–4)
- PONV risk：0 factors → ≈10% (0/1/2/3/4 factors ≈ 10/20/40/60/80%)
- Prophylaxis direction：Low risk: routine management, single-agent prophylaxis if needed
- Note：Each additional risk factor raises PONV risk by ~20%. Prophylaxis is recommended at ≥ 2 factors. Can combine with the Koivuranta score (adding age, surgery duration)
| Female | Yes (1) |
|---|---|
| Non-smoker | Yes (non-smoker, 1) |
| History of PONV or motion sickness | Yes (1) |
| Postoperative opioid use | Yes (1) |
→Apfel4(0–4)
- PONV risk：4 factors → ≈80% (0/1/2/3/4 factors ≈ 10/20/40/60/80%)
- Prophylaxis direction：High risk: multimodal prophylaxis (combine 2–3 antiemetics, e.g. dexamethasone + 5-HT₃ antagonist ± NK-1 antagonist), total intravenous anesthesia (propofol), reduce opioids/volatile anesthetics, modest fluids
- Note：Each additional risk factor raises PONV risk by ~20%. Prophylaxis is recommended at ≥ 2 factors. Can combine with the Koivuranta score (adding age, surgery duration)
Common questions
What is Postoperative Nausea & Vomiting Risk (Apfel simplified score)?
The Apfel simplified score predicts postoperative nausea and vomiting (PONV) after general anesthesia from four risk factors, guiding the intensity of antiemetic prophylaxis.
How is Postoperative Nausea & Vomiting Risk (Apfel simplified score) calculated? What is the core formula?
One point each for female sex, non-smoker, history of PONV/motion sickness, and postoperative opioid use. 0/1/2/3/4 factors ≈ 10/20/40/60/80% PONV risk.
When is Postoperative Nausea & Vomiting Risk (Apfel simplified score) used?
Use preoperatively to estimate PONV risk and decide on single-agent versus multimodal prophylaxis and anesthetic technique (e.g. TIVA, opioid reduction).
What are the key clinical points for Postoperative Nausea & Vomiting Risk (Apfel simplified score)?
Each additional risk factor raises PONV risk by roughly 20%, and prophylaxis is generally recommended once two or more factors are present. (original synthesis · not guideline verbatim) High-risk patients (≥ 3 factors) benefit from multimodal prophylaxis combining 2–3 antiemetics plus total intravenous anesthesia and opioid sparing. The score can be combined with the Koivuranta score, which adds age and surgery duration.
What are the limits and cautions when using Postoperative Nausea & Vomiting Risk (Apfel simplified score)?
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 Postoperative Nausea & Vomiting Risk (Apfel simplified score) calculated in practice? Can you show a worked example?
Inputs: Female No (0), Non-smoker No (smoker, 0), History of PONV or motion sickness No (0), Postoperative opioid use No (0) → Result: Apfel 0 (0–4)（PONV risk: 0 factors → ≈10% (0/1/2/3/4 factors ≈ 10/20/40/60/80%), Prophylaxis direction: Low risk: routine management, single-agent prophylaxis if needed, Note: Each additional risk factor raises PONV risk by ~20%. Prophylaxis is recommended at ≥ 2 factors. Can combine with the Koivuranta score (adding age, surgery duration)） Inputs: Female Yes (1), Non-smoker Yes (non-smoker, 1), History of PONV or motion sickness Yes (1), Postoperative opioid use Yes (1) → Result: Apfel 4 (0–4)（PONV risk: 4 factors → ≈80% (0/1/2/3/4 factors ≈ 10/20/40/60/80%), Prophylaxis direction: High risk: multimodal prophylaxis (combine 2–3 antiemetics, e.g. dexamethasone + 5-HT₃ antagonist ± NK-1 antagonist), total intravenous anesthesia (propofol), reduce opioids/volatile anesthetics, modest fluids, Note: Each additional risk factor raises PONV risk by ~20%. Prophylaxis is recommended at ≥ 2 factors. Can combine with the Koivuranta score (adding age, surgery duration)）
Run Postoperative Nausea & Vomiting Risk (Apfel simplified score) now
The Apfel simplified score predicts postoperative nausea and vomiting (PONV) after general anesthesia from four risk factors, guiding the intensity of antiemetic prophylaxis.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.