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CATCH Pediatric Head Injury CT Decision Rule
x402
CATCH Pediatric Head Injury CT Decision Rule 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 CATCH (2010) clinical decision rule to determine if CT is indicated after pediatric minor head injury, returning high/medium/low risk classification based on 7 caller-assigned findings.
Price / call$0.005
Success—
StatusUnknown
How this service works
CATCH (Osmond 2010). CT indicated if any of 7 caller-assigned findings after pediatric minor head injury. High (neurologic intervention): GCS <15 at 2h, open/depressed skull fracture, worsening headache, irritability. Medium if not high (brain injury on CT): basal skull fracture, large boggy scalp hematoma, dangerous mechanism. Low if none. Not PECARN, CHALICE, Canadian CT Head, NEXUS, or CATCH-2. magent does not examine the child or read CT. Not a diagnosis or medical device.
Output
Returns a CATCH risk classification — high (neurologic intervention risk, CT indicated), medium (brain injury on CT risk, CT indicated), or low (no high or medium findings, CT not indicated by this rule alone) — based on the 7 boolean flags provided by the caller. The endpoint does not examine the patient or read imaging; all inputs are caller-assigned.
Example use cases
ED triage after playground fall
“A 7-year-old fell off a jungle gym — GCS is 15 at 2 hours, no open skull fracture suspected, no worsening headache, not irritable, no basal skull fracture signs, but there's a large boggy scalp hematoma and it was a fall from elevation over 3 feet. Run the CATCH rule and tell me if CT is indicated.”
Post-MVC pediatric head assessment
“Kid was in a motor vehicle collision, minor head injury. At 2 hours GCS is still 15, no suspected skull fracture, headache is not worsening, no irritability, no basal skull fracture signs, no boggy hematoma, but dangerous mechanism is yes because it was an MVC. What does the CATCH rule say about CT?”
Irritable infant after head bump
“8-month-old bumped their head. GCS less than 15 at 2 hours is false, no open fracture suspected, no worsening headache, but the infant is irritable on exam. No basal skull fracture, no scalp hematoma, mechanism is not dangerous. Can you run the CATCH decision rule and tell me the risk tier?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/catchWhen to prefer
Use this endpoint when you need to apply the specific CATCH (Osmond 2010) clinical decision rule for pediatric minor head injury CT triage, and you already have all 7 findings assigned by a qualified clinician. Prefer this over PECARN, CHALICE, Canadian CT Head, NEXUS, or CATCH-2 endpoints when the clinical team has standardized on the original CATCH rule. This is a pure computation endpoint — it does not replace clinical judgment and is not a medical device.
Side effects
- Missing any of the 7 required boolean query parameters returns a validation error
- Non-boolean values for any flag cause a schema validation failure
- Payment failure (x402) if USDC not provided or insufficient
- Network timeout if the API is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"path": "/api/calc/catch",
"count": 2,
"items": [
{
"formula": "catch",
"citation": {
"id": "osmond-2010",
"doi": "10.1503/cmaj.091421",
"pmid": "20142371",
"title": "CATCH: a clinical decision rule for the use of computed tomography in children with minor head injury",
"source": "CMAJ. 2010;182(4):341-348",
"authors": "Osmond MH, Klassen TP, Wells GA, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_lt_15_at_2h"
},
{
"met": false,
"factor": "suspected_open_or_depressed_skull_fracture"
},
{
"met": false,
"factor": "worsening_headache"
},
{
"met": false,
"factor": "irritability"
},
{
"met": false,
"factor": "basal_skull_fracture"
},
{
"met": false,
"factor": "large_boggy_scalp_hematoma"
},
{
"met": false,
"factor": "dangerous_mechanism"
}
],
"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,
"catch_low_risk": true,
"catch_high_risk": false,
"catch_medium_risk": false,
"formula_expression": "high if any of gcs_lt_15_at_2h, suspected_open_or_depressed_skull_fracture, worsening_headache, irritability; else medium if any of basal_skull_fracture, large_boggy_scalp_hematoma, dangerous_mechanism; else low; CT indicated if high or medium"
},
{
"formula": "catch",
"citation": {
"id": "osmond-2010",
"doi": "10.1503/cmaj.091421",
"pmid": "20142371",
"title": "CATCH: a clinical decision rule for the use of computed tomography in children with minor head injury",
"source": "CMAJ. 2010;182(4):341-348",
"authors": "Osmond MH, Klassen TP, Wells GA, et al."
},
"criteria": [
{
"met": false,
"factor": "gcs_lt_15_at_2h"
},
{
"met": false,
"factor": "suspected_open_or_depressed_skull_fracture"
},
{
"met": false,
"factor": "worsening_headache"
},
{
"met": false,
"factor": "irritability"
},
{
"met": false,
"factor": "basal_skull_fracture"
},
{
"met": false,
"factor": "large_boggy_scalp_hematoma"
},
{
"met": false,
"factor": "dangerous_mechanism"
}
],
"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,
"catch_low_risk": true,
"catch_high_risk": false,
"catch_medium_risk": false,
"formula_expression": "high if any of gcs_lt_15_at_2h, suspected_open_or_depressed_skull_fracture, worsening_headache, irritability; else medium if any of basal_skull_fracture, large_boggy_scalp_hematoma, dangerous_mechanism; else low; CT indicated if high or medium"
}
]
}
}Tags
x402
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