leviticus 14;21 contains an interesting point to think about when dealing with this situation, also i wouldn't broadcast your decision to others in the cong as it is a personal matter. as a student nurse myself i have been in several situations where i was asked to administer blood but there was allways someone else to do it and i simply exchanged tasks with the other nurse. i made my instructer aware of my preference not to hang blood and it was not a problem. hope it helps