| Concussion symptoms < 15 minutes. | Roberts12 | “Ding” | Return to play when asymptomatic for 20 minutes. | Return to play when asymptomatic for 1 week. | Return to play when asymptomatic for 2 to 4 weeks. |
| No PTA | |
| Cantu7 | 1 | Return to play when asymptomatic. | Return to play in 2 weeks when asymptomatic for 1 week. | Terminate season. May return next season. |
| Colorado8 | 1 | Return to play when asymptomatic for 20 minutes. | Return to play when asymptomatic for 1 week. | Terminate season. May return in 3 months. |
| AAN9 | 1 | Return to play when asymptomatic for 15 minutes. | Return to play when asymptomatic for 1 week. If second concussion in same day, terminate activity that day. | — |
|
| PTA < 30 minutes. | Roberts12 | 1 | Return to play when asymptomatic for 1 week. | Return to play after 2 weeks if asymptomatic for 1 week. | Return to play when asymptomatic for 3 to 6 months. |
| No LOC | |
| Cantu7 | 1 | Return to play when asymptomatic for 1 week. | Return to play in 2 weeks when asymptomatic for 1 week. Consider terminating season. | Terminate season. May return next season. |
| Colorado8 | 2 | Return to play when asymptomatic for 1 week. | Return to play after asymptomatic for 1 month. | Terminate season. May return next season. |
| (Concussion symptoms > 15 minutes) | AAN9 | 2 | Return to play when asymptomatic for 1 week. | Return to play after 2 weeks if asymptomatic. | — |
|
| PTA > 30 minutes, < 24 hours. | Roberts12 | 2 | Return to play when asymptomatic for 1 week. | Return to play after 1 month if asymptomatic for 1 week. | Return to play when asymptomatic for 3 to 6 months. |
| LOC < 5 minutes | |
| Cantu7 | 2 | Return to play when asymptomatic for 1 week. | Return to play after 1 month if asymptomatic for 1 week. Consider terminating season. | Terminate season. May return next season. |
| (Any LOC) | Colorado8 | 3 | Transport to hospital. Return to play 1 month after injury if asymptomatic for 2 weeks. | Terminate season. Discourage return. | — |
| (LOC for seconds) | AAN9 | 3 | Transport to hospital. Return to play when asymptomatic for 1 week. | Return to play after 1 month. | — |
|
| PTA > 24 hours. | Roberts12 | 3 | Return to play 1 month after injury if asymptomatic for 2 weeks. | Return to play after 3 to 6 months. | No return |
| LOC > 5 minutes | |
| Cantu7 | 3 | Return to play 1 month after injury if asymptomatic for 1 week. | Terminate season. | — |
| (Any LOC) | Colorado8 | 3 | Transport to hospital. Return to play 1 month after injury if asymptomatic for 2 weeks. | Terminate season. Discourage return. | — |
| (LOC lasting more than a few seconds) | AAN9 | 3 | Return to play after asymptomatic for 2 weeks. | Return to play when asymptomatic for 1 month. | — |