The MMR immunity test is used to evaluate immunity to Measles, Mumps and Rubella. The MMR immunity test is often referred to as a titer test and is often necessary for students or when no vaccination records can be provided.
Most doctors only give platelet transfusions in cases where the patient is actively bleeding and the blood won't clot. The reason is that this treatment is of limited benefit and only lasts a very short time. The problem has to do with the life of the cells. Unlike red blood cells, which on average live about 120 days, platelets on average live only eight days. When you get a transfusion of blood from someone else, some of those cells are very old and some are brand-new, so you have to assume that the average platelet's going to last only four days.
You must wait at least eight weeks (56 days) between donations of whole blood and 16 weeks (112 days) between double red cell donations. Platelet apheresis donors may give every 7 days up to 24 times per year. Regulations are different for those giving blood for themselves (autologous donors).f you give blood but decide later that your blood may not be safe to transfuse, you should call the post donation call-back telephone number you were given at the time of your donation or call 1-866-236-3276.