In a study from Bazarian et al., serum GFAP was measuredin collegiate football players before, immediately after, and 45 minutes post-game.Although no athletes sustained a diagnosed concussion, GFAP levels increasedsignificantly after the game, with magnitudes of increase correlating with bothhelmet-recorded head impact exposure and reduced white matter integrity measured viadiffusion tensor imaging. Here, GFAP is linked to brain injury.