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CHADS2 Stroke Risk Score Calculator
x402
CHADS2 Stroke 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).
Computes the CHADS2 atrial fibrillation stroke-risk score from five discrete clinical flags using the 2001 Gage methodology
Price / call$0.005
Success—
StatusUnknown
How this service works
CHADS2 score from discrete clinical flags. Use for the 2001 Gage atrial-fibrillation stroke-risk arithmetic. Deterministic published score with citation; not an anticoagulation order.
Output
Returns the integer CHADS2 score (0–6) computed from the five input clinical flags per the 2001 Gage methodology, along with interpretive context and the published citation. Higher scores indicate greater annual stroke risk in patients with atrial fibrillation.
Example use cases
Pre-anticoagulation stroke risk stratification
“My patient is 80 years old with AFib, has a history of hypertension and a prior TIA, but no diabetes or congestive heart failure — what's their CHADS2 score?”
EHR-integrated clinical documentation tool
“Compute the CHADS2 score for a 65-year-old AFib patient who has both congestive heart failure and diabetes, no hypertension, and no prior stroke or TIA.”
Risk-tier comparison across patient cohort
“What is the CHADS2 score for a 74-year-old with atrial fibrillation, hypertension, diabetes, and heart failure but no prior stroke or TIA?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/chads2When to prefer
Use this endpoint when you need a deterministic, citation-backed CHADS2 score calculation based on the original 2001 Gage methodology for atrial fibrillation stroke risk stratification. Prefer this over CHA2DS2-VASc calculators when specifically required to use the simpler 2001 5-factor model. Suitable for automated clinical workflows, EHR enrichment, or decision-support pipelines where reproducible arithmetic and a published citation are required.
Side effects
- Missing required query parameter returns validation error
- Age out of valid range (18–120) returns error
- Non-boolean value for clinical flag fields returns parsing error
- Network timeout if upstream service is unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/chads2",
"count": 2,
"items": [
{
"score": 3,
"formula": "chads2",
"citation": {
"id": "gage-2001",
"doi": "10.1001/jama.285.22.2864",
"title": "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation",
"source": "JAMA. 2001;285(22):2864-2870",
"authors": "Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ"
},
"age_years": 78,
"max_score": 6,
"components": [
{
"factor": "congestive_heart_failure",
"points": 0,
"present": false
},
{
"factor": "hypertension",
"points": 1,
"present": true
},
{
"value": 78,
"factor": "age_ge_75",
"points": 1,
"present": true
},
{
"factor": "diabetes",
"points": 1,
"present": true
},
{
"factor": "stroke_tia",
"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": "CHADS2 = CHF 1 + hypertension 1 + age≥75 1 + diabetes 1 + stroke/TIA 2; max 6"
},
{
"score": 3,
"formula": "chads2",
"citation": {
"id": "gage-2001",
"doi": "10.1001/jama.285.22.2864",
"title": "Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation",
"source": "JAMA. 2001;285(22):2864-2870",
"authors": "Gage BF, Waterman AD, Shannon W, Boechler M, Rich MW, Radford MJ"
},
"age_years": 78,
"max_score": 6,
"components": [
{
"factor": "congestive_heart_failure",
"points": 0,
"present": false
},
{
"factor": "hypertension",
"points": 1,
"present": true
},
{
"value": 78,
"factor": "age_ge_75",
"points": 1,
"present": true
},
{
"factor": "diabetes",
"points": 1,
"present": true
},
{
"factor": "stroke_tia",
"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": "CHADS2 = CHF 1 + hypertension 1 + age≥75 1 + diabetes 1 + stroke/TIA 2; max 6"
}
]
}
}Tags
x402
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