Under the commonly understood system of categorizing various degrees of severity Traumatic Brain Injury (TBI) called the Glasgow Coma Scale (GCS), there are three degrees of severity of Traumatic Brain Injury (TBI):
1. Severe Traumatic Brain Injury - where the score of the Glasgow Coma Scale is 3-8;
2. Moderate Traumatic Brain Injury- where the score of the Glasgow Coma Scale is 9-12; and
3. Mild Traumatic Brain Injury- where the score of the Glasgow Coma Scale is 13-15.