Researchers have made a discovery that could be helpful when it comes to diagnosing CTE.

CTE is a brain disease caused by concussions and repeated blows to the head. Currently, it can only be diagnosed after someone dies.

However, scientists say there is a big effort to find what they call biomarkers, which are tests they can do to indicate somebody is at risk of developing CTE or long-term consequences of head impacts. There appear to be some elements in blood that can be measured to follow football players, hockey players, soccer players and the military.

Researchers say the test could also be useful int h development of future medications.