| Classification | Description | Notes |
| Grade 1 | Luminal irregularity or a dissection/intramural hematoma with <25% luminal narrowing | |
| Grade 2 | Dissection or intramural hematoma ≥25% luminal narrowing | |
| Grade 3 | Pseudoaneurysm | |
| Grade 4 | Vessel occlusion | |
| Grade 5 | Vessel transection |
Biffl, W. L., et al. (1999). “Blunt carotid arterial injuries: implications of a new grading scale.” J Trauma 47(5): 845-853.
Arthurs, Z. M. and B. W. Starnes (2008). “Blunt carotid and vertebral artery injuries.” Injury 39(11): 1232-1241.