Hi Kim,
well I didn't take blood with me to the Alphaklinik, obviously your own blood is better than donated blood.
It depends how the surgery goes I only lost 100ml during my surgery, so it didn't matter in my case. Some people do need a transfusion it just is an unknown how the surgery will go.
It should not be usual that a lot of blood is lost during ADR but it's always a risk
best,
Alastair
