The American Red Cross says you cannot donate Blood Plasma if you’ve had the vaccine, because the vaccine wipes out the body’s natural antibodies.
Can I donate COVID-19 convalescent plasma if I have received the vaccination?
At this time individuals who have received a COVID-19 vaccine are not able to donate convalescent plasma with the Red Cross. The Red Cross is working as quickly as possible to evaluate this change – as it may involve complex system updates. Please know, the Red Cross is committed to building a readily available inventory of convalescent plasma to ensure patients battling COVID-19 have all treatment options available to them.