How long must a plasmapheresis donor wait before donating whole blood?

• A. 24 hours
• B. 48 hours
• C. 72 hours
• D. 96 hours

Answer: (B)

After plasmapheresis, the key concern is restoring circulating plasma volume before a whole-blood donation. Plasmapheresis removes plasma but leaves red cells largely intact, so the body needs time to replenish that plasma. Waiting 48 hours gives a safe margin for plasma repletion and helps prevent hypovolemia or donor discomfort during the whole-blood collection. Shorter intervals risk insufficient plasma recovery, while longer intervals aren’t generally required by standard guidelines.