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Blood test offers swifter, safer diagnosis of sport brain injury

Swedish researchers say they have devised a blood test that could better diagnose sports-related brain injuries and prevent American football, rugby and ice hockey players returning to the field in danger.

In findings from a study of ice hockey players, the researchers said their method can show just an hour after a head injury how severe the concussion is, whether there is a risk of long-term symptoms, and when the player can return to the sport.

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