Colorado Medical Society Guidelines
The Colorado Medical Society guidelines were published in 1991 in response to the death of a high school athlete due to what was thought to be second-impact syndrome. According to the guidelines, a grade I concussion consists of confusion only, grade II includes confusion and post-traumatic amnesia, and grade III and IV involve a loss of consciousness.
By these guidelines, an athlete who has suffered a concussion may return to sports after having been free of symptoms, both at rest and during exercise, as shown in the following table:
| Grade | First concussion | Subsequent concussions |
|---|---|---|
| I | 15 minutes | 1 week |
| II | 1 week | 2 weeks, with physician approval |
| IIIa (unconscious for seconds) |
1 month | 6 month, with physician approval |
| IIIb (unconscious for minutes) |
6 month | 1 year, with physician approval |
Read more about this topic: Concussion Grading Systems
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