The other thing people should have more awareness of is that plasma and blood have opposite compatibilities; a universal plasma donor will have blood only compatible to their blood type and vice versa.

Which makes the hollywood trope of ‘i’m a universal donor’ really silly. Universal donor of what? And then they pump the blood and plasma straight into the other person pretty much guaranteeing problems since either the blood or plasma will be incompatible. The only reason blood donation works is due to machines that separate the blood and plasma.

When people are directly piped to each other in movies, I often wonder if there is some negotiation protocol like PD that ensures that the donor continues to charge the recipient, even when their capacities both reach equilibrium.