What does "If in doubt, sit them out" mean in practice?

"If in doubt, sit them out!" is the guiding principle of the AIS Concussion and Brain Health Position Statement 2024. In practice:

• Any athlete suspected of concussion is removed from play, with no return to sport on that day.
• Anyone who is "not quite themselves" after a forceful blow should be assumed to have a concussion and be removed from play.
• A player with any doubt about concussion must not return to sport until cleared by a medical practitioner.
• Coaches should not return the athlete to the game before they have seen a medical practitioner.
• Under-reporting is a problem, so coaches and parents need to recognise symptoms when no medical staff are present.