NEXUS C-spine rule (Hoffman 2000)
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.
Asked 1.4x its listed price for its own exampleour last check, 2026-09-28
1 of 1checks answered this week
284 msmedian answer time
$0.005listed price per call
$0.007price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.magentlab.com/api/calc/nexus
| Category | Everything else |
|---|---|
| Provider host | api.magentlab.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-28 | valid payment request | 402 | $0.007 | 284 ms |
Example input (from the provider)
{
"body": {
"items": [
{
"distracting_injury": false,
"focal_neuro_deficit": false,
"intoxication": false,
"midline_cervical_tenderness": false,
"normal_alertness": true
},
{
"distracting_injury": false,
"focal_neuro_deficit": false,
"intoxication": false,
"midline_cervical_tenderness": false,
"normal_alertness": true
}
]
},
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"items": {
"items": {
"properties": {
"distracting_injury": {
"description": "Painful, distracting injury. true means a distracting injury is present and the low-risk criterion fails. true or false as assigned by the caller.",
"type": "boolean"
},
"focal_neuro_deficit": {
"description": "Focal neurologic deficit. true means a deficit is present and the low-risk criterion fails. true or false as assigned by the caller.",
"type": "boolean"
},
"intoxication": {
"description": "Intoxication. true means intoxicated and the low-risk criterion fails. true or false as assigned by the caller.",
"type": "boolean"
},
"midline_cervical_tenderness": {
"description": "Posterior midline cervical-spine tenderness. true means tenderness is present and the low-risk criterion fails. true or false as assigned by the caller.",
"type": "boolean"
},
"normal_alertness": {
"description": "Normal alertness. true means alertness is normal and the low-risk criterion holds; false is altered alertness and the criterion fails.",
"type": "boolean"
}
},
"required": [
"midline_cervical_tenderness",
"focal_neuro_deficit",
"normal_alertness",
"intoxication",
"distracting_injury"
],
"type": "object"
},
"maxItems": 25,
"minItems": 1,
"type": "array"
}
},
"required": [
"items"
],
"type": "object"
},
"headers": {
"additionalProperties": {
"type": "string"
},
"type": "object"
},
"method": {
"const": "POST",
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}