Why is concussion baseline testing important?

Because symptoms disappearing or going away after a concussion is considered a poor indication of brain recovery.

A concussion causes disturbances in brain cells, changes in blood flow to the brain, and a number of other functional issues. Research shows that prior to full recovery from a concussion, the brain is very vulnerable. Even smaller impacts could cause another concussion, which could result in severe brain injury or, in rare cases, death.

The safest thing that a concussed athlete can do is avoid returning to high-risk sports until after they have fully recovered from their concussion; not just from their symptoms, but also from a brain function standpoint.

So, how do you know that you have "functionally" recovered? Comparison with your personalized multi-modal baseline scores.