Hi Linda, I am a newbie with OC but I do know some stuff about blood transfusions.You can talk to the lab for extra peace of mind but I do know much has been done in this regard.
There are strict protocals that the hospitals now need to follow to make sure that blood is not infected.

Years ago there were major lawsuits resulting from infected blood and it has changed how the blood is accepted, screened,etc.

Some hospitals will also allow friends and/or relatives that match to "bank blood" if it is known that blood may be needed.