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Duke Treadmill Score Calculator (Mark 1991)
x402
Duke Treadmill Score Calculator (Mark 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).
Calculates the Mark 1991 Duke Treadmill Score from exercise duration, ST-segment deviation, and angina index to stratify coronary artery disease risk.
Price / call$0.005
Success—
StatusUnknown
How this service works
Mark 1991 Duke treadmill score: duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index), 1 decimal. Angina index 0 none, 1 nonlimiting, 2 exercise-limiting. High if score < -10, moderate -10 to 4, low >= 5. Not a catheterization order, CAD diagnosis, or Bruce-protocol prescription. magent does not read the ECG.
Output
Returns the Duke Treadmill Score as a number with one decimal place, calculated as: exercise_min − (5 × st_deviation_mm) − (4 × angina_index). Also indicates the risk category: high (score < −10), moderate (score −10 to 4), or low (score ≥ 5).
Example use cases
Post-stress-test risk stratification
“My patient just finished a Bruce protocol stress test — they lasted 8.5 minutes, had 1.5mm of ST depression, and reported nonlimiting chest pain during exercise. What's their Duke Treadmill Score and what risk category does that put them in?”
Automated cardiology report enrichment
“For our cardiology workflow, compute the Duke Treadmill Score for a patient who exercised 12 minutes, had no ST deviation, and had no angina at all, and tell me if they're in the low-risk group.”
High-risk treadmill result flagging
“We have a stress test result: the patient only managed 5 minutes, had 3mm of ST-segment deviation, and had exercise-limiting angina — what's their Duke score and is that high risk?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/duke_treadmillWhen to prefer
Use this endpoint when you need a fast, deterministic computation of the Mark 1991 Duke Treadmill Score from already-extracted clinical parameters. It does not interpret or read ECGs, does not prescribe Bruce protocol, and is not a CAD diagnosis tool — it is purely a scoring calculator. Prefer this over manual formula application when building cardiology workflows, automated report generation, or risk stratification pipelines.
Side effects
- Missing required query parameter (exercise_min, st_deviation_mm, or angina_index) returns a 4xx error
- angina_index not one of 0, 1, or 2 (integer enum) returns a validation error
- exercise_min or st_deviation_mm out of expected range may yield a warning or error
- Payment not provided or insufficient (x402 protocol) returns 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/duke_treadmill",
"count": 2,
"items": [
{
"formula": "duke_treadmill",
"citation": {
"id": "mark-1991",
"doi": "10.1056/NEJM199109193251204",
"pmid": "1875969",
"title": "Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease",
"source": "N Engl J Med. 1991;325(12):849-853",
"authors": "Mark DB, Shaw L, Harrell FE Jr, Hlatky MA, Lee KL, Bengtson JR, McCants CB, Califf RM, Pryor DB"
},
"duke_band": "low",
"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.",
"angina_index": 0,
"exercise_min": 10,
"st_deviation_mm": 1,
"formula_expression": "duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index)",
"duke_treadmill_score": 5
},
{
"formula": "duke_treadmill",
"citation": {
"id": "mark-1991",
"doi": "10.1056/NEJM199109193251204",
"pmid": "1875969",
"title": "Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease",
"source": "N Engl J Med. 1991;325(12):849-853",
"authors": "Mark DB, Shaw L, Harrell FE Jr, Hlatky MA, Lee KL, Bengtson JR, McCants CB, Califf RM, Pryor DB"
},
"duke_band": "low",
"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.",
"angina_index": 0,
"exercise_min": 10,
"st_deviation_mm": 1,
"formula_expression": "duke_treadmill_score = exercise_min - (5 * st_deviation_mm) - (4 * angina_index)",
"duke_treadmill_score": 5
}
]
}
}Tags
x402
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