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NEXUS C-Spine Rule Calculator
x402
NEXUS C-Spine Rule 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).
Evaluates the five NEXUS low-risk criteria to determine whether cervical-spine imaging is indicated after blunt trauma in adults
Price / call$0.005
Success—
StatusUnknown
How this service works
NEXUS C-spine rule (Hoffman 2000). The patient is NEXUS low-risk, and imaging is not indicated by this rule, only when all five hold: no posterior midline cervical-spine tenderness, no focal neurologic deficit, normal alertness, no intoxication, and no painful distracting injury. Any failed criterion means x-ray is indicated. Not a diagnosis, not the Canadian C-spine rule, and not NEXUS chest. Blunt-trauma adults as published. magent does not examine the patient.
Output
A structured determination of whether the patient meets NEXUS low-risk criteria — specifically whether all five criteria hold (making imaging not indicated) or whether any criterion fails (making imaging indicated), along with the pass/fail status of each individual criterion.
Example use cases
ED triage cervical clearance decision
“Patient came in after a car accident — no midline cervical tenderness, no neurologic deficits, fully alert, not intoxicated, but has a painful rib fracture. Does the NEXUS rule say we need to image the c-spine?”
Rule out imaging for low-risk trauma
“I have a blunt trauma patient who is alert, sober, has no posterior midline neck tenderness, no focal neuro deficits, and no distracting injuries — run the NEXUS criteria and tell me if x-ray is indicated.”
Intoxicated trauma patient imaging decision
“Patient was in a bar fight, has blunt neck trauma, appears intoxicated — no midline tenderness, no neuro deficits, alert otherwise, no distracting injuries. What does the NEXUS rule say about cervical imaging?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/nexusWhen to prefer
Use this endpoint when you need to apply the validated Hoffman 2000 NEXUS criteria specifically for cervical spine imaging decisions in adult blunt trauma patients. Prefer this over the Canadian C-Spine Rule when the patient population matches the original NEXUS publication (e.g. any alertness level, any age adult). Do not use for chest imaging decisions, penetrating trauma, or pediatric patients.
Side effects
- Missing any of the five required boolean query parameters returns a validation error
- Incorrect boolean types (e.g. strings instead of true/false) will cause schema rejection
- Result is rule-based only — does not account for Canadian C-Spine Rule or NEXUS chest criteria
- Not valid for pediatric patients or non-blunt trauma mechanisms
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/nexus",
"count": 2,
"items": [
{
"formula": "nexus",
"citation": {
"id": "hoffman-2000",
"doi": "10.1056/NEJM200007133430203",
"title": "Validity of a set of clinical criteria to rule out injury to the cervical spine in patients with blunt trauma",
"source": "N Engl J Med. 2000;343(2):94-99",
"authors": "Hoffman JR, Mower WR, Wolfson AB, Todd KH, Zucker MI; National Emergency X-Radiography Utilization Study Group"
},
"criteria": [
{
"met": true,
"factor": "no_midline_cervical_tenderness"
},
{
"met": true,
"factor": "no_focal_neuro_deficit"
},
{
"met": true,
"factor": "normal_alertness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_distracting_injury"
}
],
"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.",
"nexus_low_risk": true,
"xray_indicated": false,
"formula_expression": "NEXUS low-risk iff no posterior midline cervical-spine tenderness and no focal neurologic deficit and normal alertness and no intoxication and no painful distracting injury"
},
{
"formula": "nexus",
"citation": {
"id": "hoffman-2000",
"doi": "10.1056/NEJM200007133430203",
"title": "Validity of a set of clinical criteria to rule out injury to the cervical spine in patients with blunt trauma",
"source": "N Engl J Med. 2000;343(2):94-99",
"authors": "Hoffman JR, Mower WR, Wolfson AB, Todd KH, Zucker MI; National Emergency X-Radiography Utilization Study Group"
},
"criteria": [
{
"met": true,
"factor": "no_midline_cervical_tenderness"
},
{
"met": true,
"factor": "no_focal_neuro_deficit"
},
{
"met": true,
"factor": "normal_alertness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_distracting_injury"
}
],
"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.",
"nexus_low_risk": true,
"xray_indicated": false,
"formula_expression": "NEXUS low-risk iff no posterior midline cervical-spine tenderness and no focal neurologic deficit and normal alertness and no intoxication and no painful distracting injury"
}
]
}
}Tags
x402
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