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Apfel 1999 PONV Risk Score Calculator
x402
Apfel 1999 PONV Risk Score Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Calculates the simplified Apfel 1999 PONV (postoperative nausea and vomiting) risk score (0–4) from four binary predictors: female sex, history of motion sickness or PONV, nonsmoking status, and postoperative opioid use.
Price / call$0.005
Success—
StatusUnknown
How this service works
Apfel 1999 simplified PONV risk score. Four caller-assigned predictors, 1 each, max 4: female sex, history of motion sickness or PONV, nonsmoking, postoperative opioids. Male and smokers score 0 on those items. Returns the integer score as bands 0-4. Apfel 1999 reported incidences by score; this tool returns the integer score without those percents. Not a medical device, not a prophylaxis order, not a diagnosis of PONV. Caller assigns history and opioid plan; magent does not take an anesthetic.
Output
Returns an integer Apfel PONV risk score between 0 and 4, representing the sum of the four binary risk factors (female sex, history of motion sickness or PONV, nonsmoking, postoperative opioids). Does not return incidence percentages, prophylaxis recommendations, or a diagnosis.
Example use cases
Preoperative PONV risk screening
“My patient is female, a nonsmoker, has a history of PONV from a prior surgery, and we're planning postoperative opioids — what's her Apfel PONV score?”
PONV score for male smoker without opioids
“Calculate the Apfel PONV score for a male patient who smokes, has no history of motion sickness or PONV, and will not be receiving postoperative opioids.”
Risk score for shared decision-making
“I need the Apfel 1999 PONV score for a female nonsmoker with no history of motion sickness or PONV and no planned postoperative opioids — what does she score?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/apfelWhen to prefer
Use this endpoint when you need a fast, deterministic computation of the Apfel 1999 simplified four-factor PONV risk score in an automated or agentic workflow. Prefer it over manual calculation or general-purpose LLM reasoning when auditability, consistency, and structured output are required for perioperative risk documentation or decision support pipelines.
Side effects
- Missing required query parameters (sex, history_motion_sickness_or_ponv, nonsmoker, postoperative_opioids) returns a validation error
- Invalid enum value for sex (anything other than 'female' or 'male') results in a schema error
- Non-boolean values for boolean fields cause a request error
- Payment not included or insufficient (x402 protocol) results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/apfel",
"count": 2,
"items": [
{
"sex": "male",
"band": "0",
"score": 0,
"formula": "apfel",
"citation": {
"id": "apfel-1999",
"doi": "10.1097/00000542-199909000-00022",
"pmid": "10485781",
"title": "A simplified risk score for predicting postoperative nausea and vomiting: conclusions from cross-validations between two centers.",
"source": "Anesthesiology. 1999;91(3):693-700",
"authors": "Apfel CC, Läärä E, Koivuranta M, Greim CA, Roewer N"
},
"max_score": 4,
"components": [
{
"factor": "female",
"points": 0,
"present": false
},
{
"factor": "history_motion_sickness_or_ponv",
"points": 0,
"present": false
},
{
"factor": "nonsmoker",
"points": 0,
"present": false
},
{
"factor": "postoperative_opioids",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "Apfel = female + history_motion_sickness_or_ponv + nonsmoker + postoperative_opioids; each 1 if true; max 4"
},
{
"sex": "male",
"band": "0",
"score": 0,
"formula": "apfel",
"citation": {
"id": "apfel-1999",
"doi": "10.1097/00000542-199909000-00022",
"pmid": "10485781",
"title": "A simplified risk score for predicting postoperative nausea and vomiting: conclusions from cross-validations between two centers.",
"source": "Anesthesiology. 1999;91(3):693-700",
"authors": "Apfel CC, Läärä E, Koivuranta M, Greim CA, Roewer N"
},
"max_score": 4,
"components": [
{
"factor": "female",
"points": 0,
"present": false
},
{
"factor": "history_motion_sickness_or_ponv",
"points": 0,
"present": false
},
{
"factor": "nonsmoker",
"points": 0,
"present": false
},
{
"factor": "postoperative_opioids",
"points": 0,
"present": false
}
],
"disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
"formula_expression": "Apfel = female + history_motion_sickness_or_ponv + nonsmoker + postoperative_opioids; each 1 if true; max 4"
}
]
}
}Tags
x402
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