Table 1.

Mayo Classification System for TBI Injury Severity

A. Classify as moderate to severe (definite) TBI if one or more of the following criteria apply:

1. Death due to this TBI

2. Loss of consciousness of 30 min or more

3. Post-traumatic anterograde amnesia of 24 h or more

4. Worst Glasgow Coma Scale full score in first 24 h < 13 (unless invalidated upon review, e.g., attributable to intoxication, sedation, or systemic shock)

5. One or more of the following is present:

• Intracerebral hematoma

• Subdural hematoma

• Epidural hematoma

• Cerebral contusion

• Hemorrhagic contusion

• Penetrating TBI (dura penetrated)

• Subarachnoid hemorrhage

• Brainstem injury

B. If none of criteria A apply, classify as mild (probable) TBI, if one or more of the following criteria apply:

1. Loss of consciousness of momentary to less than 30 min

2. Post-traumatic anterograde amnesia of momentary to less than 24 h

3. Depressed, basilar, or linear skull fracture (dura intact)

C. If none of criteria A or B apply, classify as symptomatic (possible) TBI, if one or more of the following symptoms are present:

1. Blurred vision

2. Confusion (mental state changes)

3. Dazed

4. Dizziness

5. Focal neurological symptoms

6. Headache

7. Nausea

TBI, traumatic brain injury.