Smits 2007 CHIP rule (adults ≥16, GCS 13-15). CT if ≥1 major (pedestrian/cyclist vs vehicle, ejected, vomiting, PTA ≥4 h, skull-fracture signs, GCS <15, GCS drop ≥2 at 1 h, anticoagulants, posttraumatic seizure, age ≥60) or ≥2 minor (fall from elevation, persistent anterograde amnesia, PTA 2 to <4 h, skull contusion, neurologic deficit, LOC, GCS drop of 1 at 1 h, age 40-60). Not a diagnosis; not Canadian CT Head, NEXUS, PECARN, or 2022 CHIP. magent does not examine the patient.

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