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Canadian CT Head Injury/Trauma Rule

Suspected depressed or open skull fractures
No 0
Yes 1
Any symptom of basilar skull fracture?
Hemotympanum, raccoon eyes, Battle’s Sign, CSF oto-/rhinorrhea
No 0
Yes 1
>=2 episodes of vomiting
No 0
Yes 1
Age>=65
No 0
Yes 1
Retrograde amnesia to >=30 minutes
No 0
Yes 1
Dangerous” mechanism?
Pedestrian struck by motor vehicle, occupant ejected from motor vehicle, or fall from > 3 feet or > 5 stairs
No 0
Yes 1
Result:

Background

Result Interpretation

Ranges Ranges