I think ~300 ml per three months is the limit? Maybe twice that amount in a super emergency..? But then the donor will also need to receive a blood transfusion.
I think ~300 ml per three months is the limit? Maybe twice that amount in a super emergency..? But then the donor will also need to receive a blood transfusion.
In the US, it's 1 pint (473mL) every 2 months. There is a "double red" donation that you can do where you give twice as much, but also with twice the wait time afterwards, and you have to be hooked up to a machine during the donation.