CT Head Rule is only required for application in patients with minor head injuries who have any one of the following:
	High risk (for neurologic intervention)
		GCS score <15 at two hours after injury
		Suspected open or depressed skull fracture
		Any sign of basal skull fracture (hemotympanum, “raccoon” eyes, cerebrospinal fluid otorrhoea/rhinorrhea, Battle's sign)
		Vomiting two episodes
		Age 65 years
	Medium risk (for brain injury on CT)
		Amnesia before impact >30 minutes
		Dangerous mechanism (pedestrian struck by motor vehicle, occupant ejected from motor vehicle, fall from height >3 feet or five stairs)
note: Minor head injury is defined as witnessed loss of consciousness, definite amnesia or witnessed disorientation in a patient with a GCS score of 13 to 15.