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.
2. Some cancer treatments cause a loss of platelets. These specialized blood cells help control blood clotting. When platelet levels fall too low, patients may need a transfusion of platelets to replenish their supply and prevent life-threatening hemorrhages. Some patients, especially those who have had a bone marrow transplant or who are being treated for leukemia, may require daily platelet transfusions for several weeks.