Originally introduced by Stein et al in 1995, it has since been revised to its current standard by the Scandinavian Neurotrauma Committee (SNC).

• Minimal head injury: a patient with GCS 15 at admission and with no LOC or focal neurological deficits.

• Mild head injury: initial GCS of 14–15, brief LOC (<5 min) and no focal neurological deficits.

• Moderate head injury: initial GCS of 9–13 and/or focal neurological deficits or LOC 3 5 min after head trauma.

• Severe head injury: initial GCS score of 8 or below, hence, unconscious patients.