Table 1.

Assessment of TBI severity according to the patient’s clinical presentation and structural imaging.

	Glasgow Coma Scale (GCS)	Duration of Loss of Consciousness (LOC)	Post-Traumatic Amnesia (PTA)	Neuroimaging
Severity	A numerical assessment tool utilized to evaluate a patient’s consciousness and neurological status following a brain injury. Scoring is based on the best eye-opening response (1–4 points), motor response (1–6 points), and verbal response (1–5 points).	The length of time a person remains unconscious following TBI.	The period following a brain injury during which a patient experiences a gap in their memory, not being able to form continuous memories of events occurring around them.	Computerized tomography (CT) is frequently primary imaging modality in the acute phase, but magnetic resonance imaging (MRI) has better sensitivity and specificity, particularly in the identification of diffusion axonal injury.
Mild	13–15	<20 min to 1 h	A few mins to less than 24 h	Normal
Moderate	9–12	1 h to 24 h	1–7 days	Normal or abnormal
Severe	3–8	>24 h	>7 days	Abnormal