If there isn't, there should be. As I have said many times on this site, I have a huge respect for nurses, but they cannot be expected to keep up to date with all of the latest reasons why a transfusion is, or is not the best or safest treatment for a particular patient, with a particular condition. It is equally difficult for a doctor to keep up-to-date, but it is easier to keep the Consultant Physician/Surgeon abreast of such things, via the Haematologist, and for him/her to cascade this "news" to their staff, and these more junior doctors would also have the knowledge (or should have the knowledge) to answer any of the patient's questions on the subject honestly.