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Canadian C-Spine Rule Calculator (Stiell 2001)
x402
Canadian C-Spine Rule Calculator (Stiell 2001) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-10).
Applies the Canadian C-Spine Rule to determine whether cervical radiography is indicated for an alert, stable adult blunt-trauma patient with GCS 15
Price / call$0.005
Success—
StatusUnknown
How this service works
Deterministic published-formula arithmetic plus ICD-10-CM, RxNorm, and LOINC. Pay in USDC on Base via x402.
Output
Returns a structured result indicating whether cervical radiography is indicated, which high-risk factors (if any) were present, which low-risk factors (if any) were present, and whether neck rotation assessment was consulted — following the Stiell 2001 Canadian C-Spine Rule decision tree for GCS-15 blunt trauma adults.
Example use cases
Post-MVA triage decision in ED
“I have a 72-year-old alert patient who came in after a moderate car accident — not a simple rear-end collision. She reports tingling in her hands. She's ambulatory and sitting in the ED. Can she skip the cervical x-ray, or is imaging required by Canadian C-spine?”
Young trauma patient avoiding unnecessary imaging
“My 34-year-old patient walked in after a minor rear-end MVC, no paresthesias, sitting comfortably in the ED, came in ambulatory, reports only delayed neck pain, no midline tenderness, and can actively rotate his neck 45 degrees each way. Does the Canadian C-spine rule say he needs a cervical x-ray?”
Clinical documentation support for trauma workflow
“We're building an automated triage tool. Run the Canadian C-spine rule for a 65-year-old patient with a dangerous mechanism, no paresthesias, not ambulatory, and with midline C-spine tenderness — do the Stiell 2001 criteria mandate radiography?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/canadian_cspine?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a validated, rule-based clinical decision support calculation for cervical spine imaging in alert (GCS 15), stable adult blunt-trauma patients. Prefer this over NEXUS when applying the Canadian C-Spine Rule specifically (Stiell 2001). Do not use for pediatric patients, patients with altered consciousness, or penetrating trauma. Suitable for EHR automation, triage assistants, and clinical documentation workflows.
Side effects
- Missing required query parameters (age, dangerous_mechanism, paresthesias_extremities, etc.) returns a 400 error
- Age outside the valid adult range (below 18 or above 120) may return a validation error
- Non-boolean values passed for boolean fields will cause schema validation failure
- Using this for pediatric patients or patients with altered mental status is out of scope and results are not clinically applicable
- Network or payment (x402) failure may prevent response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/canadian_cspine",
"count": 2,
"items": [
{
"formula": "canadian_c_spine",
"citation": {
"id": "stiell-2001",
"doi": "10.1001/jama.286.15.1841",
"title": "The Canadian C-spine rule for radiography in alert and stable trauma patients",
"source": "JAMA. 2001;286(15):1841-1848",
"authors": "Stiell IG, Wells GA, Vandemheen KL, et al."
},
"criteria": [
{
"met": false,
"value": 40,
"factor": "high_risk",
"age_ge_65": false,
"dangerous_mechanism": false,
"paresthesias_extremities": false
},
{
"met": true,
"factor": "low_risk_allows_rom",
"sitting_in_ed": false,
"delayed_neck_pain": true,
"simple_rear_end_mvc": false,
"ambulatory_since_injury": false,
"midline_cspine_tenderness": true
},
{
"met": true,
"factor": "able_to_rotate_45"
}
],
"age_years": 40,
"high_risk": 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.",
"xray_indicated": false,
"able_to_rotate_45": true,
"formula_expression": "xray indicated if any high-risk (age >= 65 or dangerous_mechanism or paresthesias_extremities); else if no low-risk allowing ROM (simple_rear_end_mvc or sitting_in_ed or ambulatory_since_injury or delayed_neck_pain or midline_cspine_tenderness false); else if not able_to_rotate_45",
"low_risk_allows_rom": true
},
{
"formula": "canadian_c_spine",
"citation": {
"id": "stiell-2001",
"doi": "10.1001/jama.286.15.1841",
"title": "The Canadian C-spine rule for radiography in alert and stable trauma patients",
"source": "JAMA. 2001;286(15):1841-1848",
"authors": "Stiell IG, Wells GA, Vandemheen KL, et al."
},
"criteria": [
{
"met": false,
"value": 40,
"factor": "high_risk",
"age_ge_65": false,
"dangerous_mechanism": false,
"paresthesias_extremities": false
},
{
"met": true,
"factor": "low_risk_allows_rom",
"sitting_in_ed": false,
"delayed_neck_pain": true,
"simple_rear_end_mvc": false,
"ambulatory_since_injury": false,
"midline_cspine_tenderness": true
},
{
"met": true,
"factor": "able_to_rotate_45"
}
],
"age_years": 40,
"high_risk": 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.",
"xray_indicated": false,
"able_to_rotate_45": true,
"formula_expression": "xray indicated if any high-risk (age >= 65 or dangerous_mechanism or paresthesias_extremities); else if no low-risk allowing ROM (simple_rear_end_mvc or sitting_in_ed or ambulatory_since_injury or delayed_neck_pain or midline_cspine_tenderness false); else if not able_to_rotate_45",
"low_risk_allows_rom": true
}
]
}
}Tags
x402
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