Evidence based Cantu revised concussion grading guidelines
| Grade 1 (Mild) | No LOC,* PTA,† PCSS‡ < 30 min |
|---|---|
| *Loss of consciousness. | |
| †Post traumatic amnesia (anterograde/retrograde). | |
| ‡Post concussion signs/symptoms. | |
| Grade 2 (Moderate) | LOC < 1 min, or PTA/PCSS > 30 min |
| Grade 3 (Severe) | LOC ≥ 1 min, or PTA ≥ 24 hrs, PCSS > 7 days |