| Level 1: AVPU System | |
| A = alert | |
| V = responds to verbal stimuli | |
| P = responds to painful stimuli | |
| U = unresponsive | |
| Level 2: Glasgow Coma Scale (GCS)* | |
| Eye opening (E) | |
| Spontaneous, already open and blinking | 4 |
| To speech | 3 |
| To pain | 2 |
| None | 1 |
| Verbal response (V) | |
| Oriented | 5 |
| Answers but confused | 4 |
| Inappropriate but recognizable words | 3 |
| Incomprehensible sounds | 2 |
| None | 1 |
| Best motor response (M) | |
| Obeys verbal commands | 6 |
| Localizes painful stimulus | 5 |
| Withdraws from painful stimulus | 4 |
| Decorticate posturing (upper extremity flexion) | 3 |
| Decerebrate posturing (upper extremity extension) | 2 |
| No movement | 1 |
*GCS score ≤8 = deep coma, severe head trauma, poor outcome.
GCS score 9–12 = conscious patient with moderate injury.
GCS score >12 = mild injury.