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DECAF Score Calculator (Steer 2012)
x402
DECAF Score Calculator (Steer 2012) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Computes the DECAF (AECOPD) score from five caller-assigned clinical variables and returns a 0–6 total with severity band.
Price / call$0.005
Success—
StatusUnknown
How this service works
Steer 2012 DECAF: eMRCD 1-4 → 0, 5a → 1, 5b → 2; eosinophils <0.05 ×10^9/L → 1 (0.05 does not score); caller-assigned consolidation → 1; arterial pH <7.30 → 1 (7.30 does not score); atrial fibrillation → 1. Returns a 0–6 total and band 0-1 / 2 / 3-6. Deterministic published points with citation. Not an early-discharge or escalation protocol and not a medical device.
Output
Returns the total DECAF score (integer 0–6) and the corresponding severity band (0–1 = low, 2 = intermediate, 3–6 = high), computed deterministically per Steer 2012 published criteria with a citation.
Example use cases
AECOPD admission severity triage
“My patient is admitted with an acute COPD exacerbation — eMRCD is 5b, eosinophils are 0.04, chest X-ray shows consolidation, arterial pH is 7.28, and they're in atrial fibrillation. What's their DECAF score and which severity band does that put them in?”
Low-risk AECOPD risk stratification
“I have a COPD patient in the ED with eMRCD 1-4, eosinophils 0.10, no consolidation on CXR, pH 7.38, and normal sinus rhythm. Can you run the DECAF score to see if they're in the low-risk band?”
Prior-auth or audit documentation
“I need to document the DECAF score for billing purposes: the patient's eMRCD was 5a, eosinophil count 0.02, consolidation present, arterial pH 7.31, and no atrial fibrillation — please compute the exact Steer 2012 points and total.”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/decafWhen to prefer
Use this endpoint when you need a deterministic, citable DECAF score per Steer 2012 for an AECOPD patient, especially in automated workflows requiring audit-grade arithmetic without manual lookup. Prefer it over general-purpose LLM computation when reproducibility and a published citation are required.
Side effects
- Missing required query parameter (emrcd, eosinophils_10e9_l, consolidation, arterial_ph, or atrial_fibrillation) — returns 4xx validation error
- arterial_ph outside physiological range 6.80–7.80 — rejected with validation error
- eosinophils_10e9_l outside 0–5 range — rejected with validation error
- Invalid emrcd enum value (must be '1-4', '5a', or '5b') — returns 4xx
- Payment not provided or insufficient USDC — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/decaf",
"count": 2,
"items": [
{
"emrcd": "1-4",
"score": 0,
"formula": "decaf",
"citation": {
"id": "steer-2012",
"doi": "10.1136/thoraxjnl-2012-202103",
"pmid": "22895999",
"title": "The DECAF Score: predicting hospital mortality in exacerbations of chronic obstructive pulmonary disease",
"source": "Thorax. 2012;67(11):970-976",
"authors": "Steer J, Gibson J, Bourke SC"
},
"max_score": 6,
"components": [
{
"value": "1-4",
"factor": "emrcd",
"points": 0,
"present": false
},
{
"value": 0.1,
"factor": "eosinopenia",
"points": 0,
"present": false
},
{
"factor": "consolidation",
"points": 0,
"present": false
},
{
"value": 7.4,
"factor": "acidemia",
"points": 0,
"present": false
},
{
"factor": "atrial_fibrillation",
"points": 0,
"present": false
}
],
"decaf_band": "0-1",
"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.",
"arterial_ph": 7.4,
"consolidation": false,
"eosinophils_10e9_l": 0.1,
"formula_expression": "DECAF = emrcd_points + eosinopenia + consolidation + acidemia + atrial_fibrillation; eMRCD 1-4 -> 0, 5a -> 1, 5b -> 2; eosinophils_10e9_l < 0.05 -> 1 (0.05 does not score); consolidation true -> 1; arterial_ph < 7.30 -> 1 (7.30 does not score); atrial_fibrillation true -> 1; bands 0-1 / 2 / 3-6; max 6",
"atrial_fibrillation": false
},
{
"emrcd": "1-4",
"score": 0,
"formula": "decaf",
"citation": {
"id": "steer-2012",
"doi": "10.1136/thoraxjnl-2012-202103",
"pmid": "22895999",
"title": "The DECAF Score: predicting hospital mortality in exacerbations of chronic obstructive pulmonary disease",
"source": "Thorax. 2012;67(11):970-976",
"authors": "Steer J, Gibson J, Bourke SC"
},
"max_score": 6,
"components": [
{
"value": "1-4",
"factor": "emrcd",
"points": 0,
"present": false
},
{
"value": 0.1,
"factor": "eosinopenia",
"points": 0,
"present": false
},
{
"factor": "consolidation",
"points": 0,
"present": false
},
{
"value": 7.4,
"factor": "acidemia",
"points": 0,
"present": false
},
{
"factor": "atrial_fibrillation",
"points": 0,
"present": false
}
],
"decaf_band": "0-1",
"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.",
"arterial_ph": 7.4,
"consolidation": false,
"eosinophils_10e9_l": 0.1,
"formula_expression": "DECAF = emrcd_points + eosinopenia + consolidation + acidemia + atrial_fibrillation; eMRCD 1-4 -> 0, 5a -> 1, 5b -> 2; eosinophils_10e9_l < 0.05 -> 1 (0.05 does not score); consolidation true -> 1; arterial_ph < 7.30 -> 1 (7.30 does not score); atrial_fibrillation true -> 1; bands 0-1 / 2 / 3-6; max 6",
"atrial_fibrillation": false
}
]
}
}Tags
x402
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