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NEXUS Chest Radiography Decision Instrument (Rodriguez 2011)
x402
NEXUS Chest Radiography Decision Instrument (Rodriguez 2011) 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).
Applies the 7-criterion NEXUS Chest rule to determine whether chest radiography is indicated in blunt trauma patients by checking for the presence of any of seven caller-assigned clinical findings.
Price / call$0.005
Success—
StatusUnknown
How this service works
NEXUS Chest (Rodriguez 2011). Chest radiography is not indicated by this instrument only when all seven caller-assigned findings are absent: chest pain, distracting injury, chest-wall tenderness, intoxication, age >60, rapid deceleration, and altered mental status. Any one present means chest x-ray is indicated. Not a diagnosis, not Hoffman 2000 NEXUS C-spine, and not a NEXUS Chest CT instrument. Derivation enrolled blunt trauma age >14. magent does not examine the patient.
Output
Returns whether chest radiography is indicated or not indicated based on the NEXUS Chest rule: if any of the seven criteria flags is true the instrument indicates chest x-ray is required; only if all seven are false is the patient considered low-risk and chest x-ray not indicated. Response reflects the Rodriguez 2011 derivation logic only.
Example use cases
Motor vehicle crash triage in ED
“A 35-year-old was in a 50 mph head-on collision. He has chest pain and is fully alert, no intoxication, no distracting injury, no chest-wall tenderness, age is under 60, and rapid deceleration is yes. Run the NEXUS Chest criteria and tell me if a chest x-ray is indicated.”
Fall from height triage
“Patient fell from a 25-foot ladder. She has chest-wall tenderness on exam and a distracting injury to her wrist. No chest pain complaint, not intoxicated, she's 55 years old so age over 60 is false, and altered mental status is absent. Apply the NEXUS Chest rule — does she need chest imaging?”
Low-risk blunt trauma screen
“I need to know if a chest x-ray can be safely skipped for a blunt trauma patient: no chest pain, no distracting injury, no chest-wall tenderness, not intoxicated, age under 60, no rapid deceleration mechanism, and mental status is normal. What does the NEXUS Chest instrument say?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/nexus_chestWhen to prefer
Use this endpoint when you need to apply the Rodriguez 2011 NEXUS Chest plain radiography rule specifically — not the NEXUS C-spine rule, not a Chest CT decision rule, and not any other chest imaging instrument. It is appropriate for blunt trauma patients over 14 years old when a caller has already assessed and assigned the seven clinical criteria. Prefer this over manual lookup when automating trauma triage workflows or building clinical decision support agents that need a programmatic, auditable application of the NEXUS Chest instrument.
Side effects
- Missing any of the seven required boolean query parameters returns a validation error
- Supplying non-boolean values for the flags causes a schema rejection
- Attempting to use this instrument for pediatric patients under 14 years old is outside the derivation population and may produce a warning or unsupported response
- Confusing this endpoint with NEXUS C-spine (Hoffman 2000) or NEXUS Chest CT instruments returns valid but contextually incorrect results for those use cases
- Network or payment authorization failure returns an HTTP 402 or connectivity error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/nexus_chest",
"count": 2,
"items": [
{
"formula": "nexus_chest",
"citation": {
"id": "rodriguez-2011",
"doi": "10.1097/TA.0b013e3181f2ac9d",
"pmid": "21045745",
"title": "Derivation of a decision instrument for selective chest radiography in blunt trauma",
"source": "J Trauma. 2011;71(3):549-553",
"authors": "Rodriguez RM, Hendey GW, Mower W, et al."
},
"criteria": [
{
"met": true,
"factor": "no_chest_pain"
},
{
"met": true,
"factor": "no_distracting_injury"
},
{
"met": true,
"factor": "no_chest_wall_tenderness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_age_gt_60"
},
{
"met": true,
"factor": "no_rapid_deceleration"
},
{
"met": true,
"factor": "no_altered_mental_status"
}
],
"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.",
"formula_expression": "NEXUS Chest low-risk iff no chest pain and no distracting injury and no chest-wall tenderness and no intoxication and age not >60 and no rapid deceleration and no altered mental status",
"chest_xray_indicated": false,
"nexus_chest_low_risk": true
},
{
"formula": "nexus_chest",
"citation": {
"id": "rodriguez-2011",
"doi": "10.1097/TA.0b013e3181f2ac9d",
"pmid": "21045745",
"title": "Derivation of a decision instrument for selective chest radiography in blunt trauma",
"source": "J Trauma. 2011;71(3):549-553",
"authors": "Rodriguez RM, Hendey GW, Mower W, et al."
},
"criteria": [
{
"met": true,
"factor": "no_chest_pain"
},
{
"met": true,
"factor": "no_distracting_injury"
},
{
"met": true,
"factor": "no_chest_wall_tenderness"
},
{
"met": true,
"factor": "no_intoxication"
},
{
"met": true,
"factor": "no_age_gt_60"
},
{
"met": true,
"factor": "no_rapid_deceleration"
},
{
"met": true,
"factor": "no_altered_mental_status"
}
],
"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.",
"formula_expression": "NEXUS Chest low-risk iff no chest pain and no distracting injury and no chest-wall tenderness and no intoxication and age not >60 and no rapid deceleration and no altered mental status",
"chest_xray_indicated": false,
"nexus_chest_low_risk": true
}
]
}
}Tags
x402
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