Do you donate blood or sell your plasma?

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I used to donate blood but now plasma is the bigger of the two in demand. It cost over $800 for it in the hospital and plasma banks can draw twice a week from a client. It is screened for diseases and you must be in good health to sell plasma. I supplement my income this way and it is easy. I take a book along to read and this is a restful time for me. I know that my blood is clean due to the intense screening that it goes through. Do you donate blood or sell your plasma?