: My Best Buy Cre… Payott – Login Login Mercury Insuranc 2 /10 111% + Order: Transfuse one unit of PRBCs (250 mL) over four hours. The “Y”intravenous (IV) tubing will deliver a drop factor of 15 gtts/ml. 6. How many ml/hr. will the nurse set the IV infusion pump during the first 15 minutes of the blood transfusion? 7. After 15 minutes how many ml/hr. Will the IV infusion pump be set at to continue the blood transfusion? 8. If an IV infusion pump is not available, calculate the drops per minute to manually regulate the blood during the first 15 minutes. 9. After the first 15 minutes, calculate the drops per minute to manually regulate the transfusion for the remainder of the transfusion.