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Guidelines for the diagnosis of TBI severity.
| Mild TBI | Moderate TBI | Severe TBI | |
| GCS | 13–15 | 9–12 | 3–8 |
| LOC | ≤30 min | >30 min but <24 h | ≥24 h |
| PTA | ≤24 h | >24 h but <7 d | ≥7 d |
| Imaging findings | No CT abnormalities | Abnormal CT findings | Abnormal CT findings |
GCS, Glasgow coma scale; LOC, Loss of consciousness; PTA, Posttraumatic amnesia; TBI, Traumatic brain injury; min, minutes; h, hours; d, days; CT, Computed tomography.
