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NEXUS Head CT Rule Calculator (Mower 2017)
x402
NEXUS Head CT Rule Calculator (Mower 2017) is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Applies the NEXUS Head CT instrument to determine whether a head CT may be safely omitted based on eight clinical criteria
Price / call$0.005
Success—
StatusUnknown
How this service works
NEXUS Head CT (Mower 2017). Low-risk, and CT may be omitted by this instrument, only when all eight are absent: age 65 or older, evidence of skull fracture, scalp hematoma, neurologic deficit, altered alertness, abnormal behavior, coagulopathy, and persistent vomiting. Age 65 is high-risk; age 64 is not on age alone. Not a diagnosis, not a CT order, not Hoffman 2000 NEXUS C-spine, and not the Canadian CT Head Rule. magent does not examine the patient.
Output
Returns a low-risk flag (true/false) indicating whether all eight NEXUS Head CT criteria are absent (true = low-risk, CT may be omitted), along with the status of each individual criterion that triggered or cleared the rule.
Example use cases
ED triage after minor head injury
“I have a 72-year-old patient in the ED after a fall with a scalp hematoma but no skull fracture, neurologic deficit, altered alertness, abnormal behavior, coagulopathy, or persistent vomiting — run the NEXUS Head CT rule and tell me if CT is indicated.”
Low-risk young adult head trauma
“Apply the NEXUS Head CT instrument to a 34-year-old who hit their head; skull fracture: false, scalp hematoma: false, neurologic deficit: false, altered alertness: false, abnormal behavior: false, coagulopathy: false, persistent vomiting: false. Can CT be omitted?”
Coagulopathy complicating head injury decision
“Check the NEXUS Head CT criteria for a 45-year-old patient on warfarin — skull fracture: false, scalp hematoma: false, neurologic deficit: false, altered alertness: false, abnormal behavior: false, coagulopathy: true, persistent vomiting: false. What does the rule say about CT?”
Technical details
Endpoint
GEThttps://api.magentlab.com/api/calc/nexus_head_ctWhen to prefer
Use this endpoint when you need to apply the Mower 2017 NEXUS Head CT rule specifically — not the Canadian CT Head Rule and not the Hoffman 2000 NEXUS C-spine rule. Prefer it when all eight criterion flags have already been clinically assessed by a provider and you need a programmatic low-risk determination for documentation, decision support, or workflow automation.
Side effects
- Missing required query parameters returns a validation error
- Age outside integer range 18–120 may be rejected
- Non-boolean values for flag parameters cause schema validation failure
- Caller-assigned findings reflect the provider's clinical assessment; the API does not validate clinical plausibility
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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