CHALICE (Dunning 2006). CT required in children 0-15 if any history, exam, or mechanism criterion is present; else low risk. GCS <14, or GCS <15 if age <1 year. Bruise/swelling/laceration >5 cm only if age <1 year. Mechanism is caller-assigned (paper: high-speed RTA >40 mph as occupant/pedestrian/cyclist; fall >3 m; high-speed projectile or object). NAI is caller-assigned. Not PECARN, CATCH, or Canadian CT Head. magent does not examine the child. Not a diagnosis or medical device.

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