It would be great to have a blood test, but I think that such tests will only detect a relatively recent brain injury, as is the case for a heart attack. There will be a window of time when the damage can be detected. So, it isn't really going to be useful for the likes of us who have had a brain injury some time ago.

I think that S100B, which is released from damaged astrocytes could be part of the test - the announcement doesn't mention which proteins are involved. I believe S100B is already used in Germany to detect concussions, so it could be used worldwide, it just needs to be set up in emergency rooms as a standard.

When I had my concussion, no one even took blood. I assume this is probably most people's experience. Even if as sample had been frozen, the test could be done years later, but if no sample was taken, then it won't be possible to detect anything at a much later date. That means that, sadly, the technique is unlikely to be useful in the monitoring of PCS or recovery from it. It will be a big advance though if emergency rooms can tell which patients are likely to have had a more serious concussion. Nowadays serious concussions can get missed.

CS