Table 1.

Diagnostic criteria for mild TBI for the Veterans Administration/Department of Defense Clinical Guidelines (Management of Concussion/mTBI Working Group, 2009) and the American College of Rehabilitation Medicine (Mild Traumatic Brain Injury Committee of the Head Injury Interdisciplinary Special Interest Group of the American Congress of Rehabilitation Medicine, 1993).

	Structural Imaging	Loss of consciousness (LOC)	Alteration of consciousness/mental state (AOC)	Post-traumatic amnesia (PTA)	Glasgow Coma Scale (GCS)
VA/DoD	Normal	0-30 min	≤24 hours	≤24 hours	Typically not available
ACRM	May be normal	0-30 min	Any	≤24 hours	13-15 within 30 min of injury