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Revised Cardiac Risk Index (RCRI) Calculator
x402
Revised Cardiac Risk Index (RCRI) Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).
Computes the Lee 1999 Revised Cardiac Risk Index score (0–6) and risk class (I–IV) from six binary clinical factors for perioperative cardiac risk estimation.
Price / call$0.005
Success—
StatusUnknown
How this service works
Lee 1999 revised cardiac risk index: six 1-point factors (high-risk surgery, ischemic heart disease, heart failure, cerebrovascular disease, insulin diabetes, creatinine >2.0 mg/dL) and class I–IV. Deterministic published arithmetic with citation; not operative clearance.
Output
Returns the numeric RCRI score (0–6, one point per positive factor) and the corresponding risk class (I–IV) based on the Lee 1999 derivation, along with the six individual factor values used in the calculation. Does not provide operative clearance.
Example use cases
Preoperative cardiac risk stratification
“I need the RCRI score for a patient scheduled for suprainguinal vascular surgery — they have a history of TIA, are on insulin, no heart failure, no ischemic heart disease, and creatinine is 1.8 mg/dL.”
EHR-integrated risk documentation
“For my patient going into an intraperitoneal procedure: ischemic heart disease yes, congestive heart failure no, cerebrovascular disease no, insulin diabetes yes, creatinine greater than 2 no, high-risk surgery yes — what's their Lee 1999 RCRI class?”
Clinical decision support for anesthesia team
“What RCRI risk class does a patient fall into if they have no high-risk surgery, no ischemic heart disease, heart failure present, no cerebrovascular disease, not on insulin, and creatinine is normal?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/rcri?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, deterministic, citeable perioperative cardiac risk score following the published Lee 1999 RCRI algorithm. Prefer it over general clinical AI when reproducibility and alignment with a specific validated index is required, such as for documentation, auditing, or EHR integration.
Side effects
- Missing any of the six required boolean query parameters returns a validation error
- Non-boolean values for flag parameters cause a schema error
- Network or payment (x402) failure prevents score retrieval
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/rcri",
"count": 2,
"items": [
{
"score": 0,
"formula": "rcri",
"citation": {
"id": "lee-1999",
"doi": "10.1161/01.CIR.100.10.1043",
"title": "Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery",
"source": "Circulation. 1999;100(10):1043-1049",
"authors": "Lee TH, Marcantonio ER, Mangione CM, et al."
},
"max_score": 6,
"components": [
{
"factor": "high_risk_surgery",
"points": 0,
"present": false
},
{
"factor": "ischemic_heart_disease",
"points": 0,
"present": false
},
{
"factor": "congestive_heart_failure",
"points": 0,
"present": false
},
{
"factor": "cerebrovascular_disease",
"points": 0,
"present": false
},
{
"factor": "insulin_diabetes",
"points": 0,
"present": false
},
{
"factor": "creatinine_gt_2",
"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.",
"rcri_class": "I",
"formula_expression": "RCRI = high_risk_surgery + ischemic_heart_disease + congestive_heart_failure + cerebrovascular_disease + insulin_diabetes + creatinine_gt_2; each 1; max 6"
},
{
"score": 0,
"formula": "rcri",
"citation": {
"id": "lee-1999",
"doi": "10.1161/01.CIR.100.10.1043",
"title": "Derivation and prospective validation of a simple index for prediction of cardiac risk of major noncardiac surgery",
"source": "Circulation. 1999;100(10):1043-1049",
"authors": "Lee TH, Marcantonio ER, Mangione CM, et al."
},
"max_score": 6,
"components": [
{
"factor": "high_risk_surgery",
"points": 0,
"present": false
},
{
"factor": "ischemic_heart_disease",
"points": 0,
"present": false
},
{
"factor": "congestive_heart_failure",
"points": 0,
"present": false
},
{
"factor": "cerebrovascular_disease",
"points": 0,
"present": false
},
{
"factor": "insulin_diabetes",
"points": 0,
"present": false
},
{
"factor": "creatinine_gt_2",
"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.",
"rcri_class": "I",
"formula_expression": "RCRI = high_risk_surgery + ischemic_heart_disease + congestive_heart_failure + cerebrovascular_disease + insulin_diabetes + creatinine_gt_2; each 1; max 6"
}
]
}
}Tags
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