For most people, not at all.
You can still donate blood if you work in an abattoir, or as a healthcare worker. But, if you're a professional athlete there are some things to consider before you donate.
We don't recommend giving blood during a competitive period or season. It could have a minor, temporary impact on performance — it’s common to feel a bit tired after donating. Consider donating during your off-season or if you’re taking a break from competition.
Also, the Australian Sports Anti-Doping Authority (ASADA) has strict guidelines about recording every blood donation, and donating plasma or platelets may even breach their regulations.
Double check with your sport’s governing body, the ASADA website or the World Anti-Doping Agency (WADA) website. We love your dedication to saving lives, but we don’t want to get you in trouble!