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POSSUM Surgical Risk Calculator (Copeland 1991)
x402
POSSUM Surgical Risk Calculator (Copeland 1991) 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).
Computes Copeland 1991 POSSUM physiologic and operative scores, then returns estimated morbidity and mortality percentages from the unrounded logit equations.
Price / call$0.005
Success—
StatusUnknown
How this service works
Copeland 1991 POSSUM surgical audit: 12 physiologic and 6 operative 1/2/4/8 items (age has no 8; ECG has no 2). Returns physiologic_score, operative_score, and estimated morbidity and mortality percents from the unrounded Copeland logits. Not P-POSSUM (Whiteley), not a diagnosis, not operative consent. magent does not examine the patient.
Output
Returns a JSON object with physiologic_score (integer sum of 12 physiologic items, each 1/2/4/8), operative_score (integer sum of 6 operative items), estimated_morbidity_percent (floating-point percent derived from the unrounded Copeland logit), and estimated_mortality_percent (floating-point percent from the Copeland logit). These are statistical estimates from the 1991 Copeland derivation dataset, not clinical diagnoses or consent documents.
Example use cases
Preoperative audit for elective bowel resection
“I need a POSSUM score for a 65-year-old patient going for elective colonic resection — GCS 15, pulse 75, systolic BP 145, hemoglobin 12.8, WBC 8.2, urea 5.9 mmol/L, sodium 140, potassium 3.9, no cardiac failure, mild respiratory limitation, normal ECG, major severity operation, single procedure, blood loss under 100 mL, no peritoneal soiling, malignant pathology, elective mode. What are the physiologic and operative scores and the predicted morbidity and mortality?”
Emergency laparotomy risk estimation
“Calculate the Copeland POSSUM risk for an 80-year-old emergency laparotomy patient: pulse 124, systolic BP 90, GCS 13, hemoglobin 9.1 g/dL, WBC 21.5, urea 14 mmol/L, sodium 132, potassium 5.2, raised JVP with cardiomegaly, severe respiratory disease on home oxygen, atrial fibrillation ECG 60-90, major-plus operative severity, multiple procedures, blood loss 500-999 mL, free bowel content soiling, node-positive malignancy, emergency surgery.”
Surgical audit data entry for quality review
“For our surgical audit, compute the POSSUM score for a 58-year-old who had an urgent cholecystectomy: GCS 15, pulse 95, systolic BP 160, hemoglobin 13.5, WBC 14.3, urea 8.8 mmol/L, sodium 136, potassium 4.0, on diuretics for hypertension, mild COPD on inhaler, normal ECG, moderate operative severity, single procedure, blood loss under 100 mL, local peritoneal soiling, benign disease, urgent surgery.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/possumWhen to prefer
Use this endpoint when you need the original Copeland 1991 POSSUM formulation — specifically when the caller has already assigned the discretized physiologic and operative item values and wants the unrounded logit-based morbidity and mortality estimates. Prefer this over P-POSSUM (Whiteley) when the standard POSSUM mortality equation (not the Portsmouth modification) is required for audit benchmarking or research replication against the original 1991 paper. Do not use for pediatric patients, purely diagnostic questions, or as a substitute for clinical evaluation.
Side effects
- Missing required query parameters returns a 400 error
- Out-of-range numeric values (e.g. GCS outside 3-15, pulse outside 20-250) may return validation errors
- Invalid enum strings for categorical fields (cardiac, ecg, operative_severity, etc.) cause request rejection
- Payment failure or insufficient USDC balance results in 402 response
- Extreme physiologic values may produce logit-derived probabilities approaching 0% or 100% but remain mathematically valid
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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