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New Orleans Head CT Rule Calculator
x402
New Orleans Head CT 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).
Applies the New Orleans (Haydel 2000) CT head rule to determine whether CT is indicated for GCS-15 minor head injury in adults based on seven clinical findings
Price / call$0.005
Success—
StatusUnknown
How this service works
New Orleans Head CT Rule (Haydel 2000). CT is indicated if any of seven findings: headache, vomiting, age over 60, drug or alcohol intoxication, short-term memory deficit (anterograde amnesia), physical evidence of trauma above the clavicles, or seizure. Published for GCS 15 minor head injury in adults; magent does not take GCS or examine the patient. Not a diagnosis, not the Canadian CT Head Rule, not PECARN, and not pediatric.
Output
Returns the result of the New Orleans Head CT Rule indicating whether a CT scan is indicated based on the presence or absence of the seven clinical criteria: headache, vomiting, age over 60, drug/alcohol intoxication, short-term memory deficit, trauma above clavicles, and seizure. Not a diagnosis; clinical judgment required.
Example use cases
ED triage CT decision for elderly patient
“I have a 72-year-old in the ED after a ground-level fall. GCS is 15. They have a headache, no vomiting, no seizure, no drug or alcohol intoxication, no memory deficit, and no visible trauma above the clavicles. Does the New Orleans rule say CT is needed?”
Intoxicated adult minor head injury evaluation
“My 34-year-old patient came in after a bar fight with a minor head injury. GCS 15, alcohol intoxication confirmed, no headache, no vomiting, no seizure, no trauma above the clavicles, and no memory problems. Run the New Orleans Head CT rule on him.”
Post-concussion amnesia CT triage
“A 45-year-old presented after a minor head injury — GCS 15, complaining of short-term memory loss. No headache, no vomiting, no seizure, not intoxicated, no trauma above the clavicles. Does the New Orleans criteria indicate CT imaging?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/new_orleans_headWhen to prefer
Use this endpoint when you need to programmatically apply the New Orleans Head CT Rule (Haydel 2000) for adult patients (18+) with GCS-15 minor head injury and need a structured, auditable computation of the seven criteria. Prefer this over manual calculation to reduce transcription errors. Do not use for pediatric patients (use PECARN), for patients with GCS below 15, or when the Canadian CT Head Rule is more appropriate.
Side effects
- Missing required query parameters (age, headache, vomiting, drug_or_alcohol_intoxication, short_term_memory_deficit, trauma_above_clavicles, seizure) returns a validation error
- Age outside integer range 18-120 may return an error or unexpected result
- Non-boolean values for boolean fields cause schema validation failure
- Payment failure (x402) blocks response
- Not applicable to pediatric patients, patients with GCS below 15, or non-minor head injuries
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/new_orleans_head",
"count": 2,
"items": [
{
"formula": "new_orleans_head",
"citation": {
"id": "haydel-2000",
"doi": "10.1056/NEJM200007133430204",
"title": "Indications for computed tomography in patients with minor head injury",
"source": "N Engl J Med. 2000;343(2):100-105",
"authors": "Haydel MJ, Preston CA, Mills TJ, Luber S, Blaudeau E, DeBlieux PM"
},
"criteria": [
{
"met": false,
"factor": "headache"
},
{
"met": false,
"factor": "vomiting"
},
{
"met": false,
"value": 40,
"factor": "age_gt_60"
},
{
"met": false,
"factor": "drug_or_alcohol_intoxication"
},
{
"met": false,
"factor": "short_term_memory_deficit"
},
{
"met": false,
"factor": "trauma_above_clavicles"
},
{
"met": false,
"factor": "seizure"
}
],
"age_years": 40,
"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.",
"ct_indicated": false,
"formula_expression": "ct indicated if any of headache, vomiting, age > 60, drug_or_alcohol_intoxication, short_term_memory_deficit, trauma_above_clavicles, or seizure"
},
{
"formula": "new_orleans_head",
"citation": {
"id": "haydel-2000",
"doi": "10.1056/NEJM200007133430204",
"title": "Indications for computed tomography in patients with minor head injury",
"source": "N Engl J Med. 2000;343(2):100-105",
"authors": "Haydel MJ, Preston CA, Mills TJ, Luber S, Blaudeau E, DeBlieux PM"
},
"criteria": [
{
"met": false,
"factor": "headache"
},
{
"met": false,
"factor": "vomiting"
},
{
"met": false,
"value": 40,
"factor": "age_gt_60"
},
{
"met": false,
"factor": "drug_or_alcohol_intoxication"
},
{
"met": false,
"factor": "short_term_memory_deficit"
},
{
"met": false,
"factor": "trauma_above_clavicles"
},
{
"met": false,
"factor": "seizure"
}
],
"age_years": 40,
"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.",
"ct_indicated": false,
"formula_expression": "ct indicated if any of headache, vomiting, age > 60, drug_or_alcohol_intoxication, short_term_memory_deficit, trauma_above_clavicles, or seizure"
}
]
}
}Tags
x402
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