A patient with mild traumatic brain injury has had a traumatically induced physiologic disruption of brain function, as manifested by 1 or more of any loss of consciousness up to 30 min, any loss of memory for events immediately before or after the accident for as much as 24 h, any alteration of mental state at the time of the accident (eg, feeling dazed, disoriented, or confused), or focal neurologic deficits that might or might not be transient, but where the severity of the injury does not exceed loss of consciousness exceeding 30 min, posttraumatic amnesia longer than 24 h, or a Glasgow Coma Scale score falling below 13 after 30 min.

Adapted from the Mild Traumatic Brain Injury Committee of the American Congress of Rehabilitation Medicine.¹