I’m a Clinical Lab Scientist with extensive experience in Transfusion service. A phlebotomist is someone who just collects blood samples by venipucture or heel stick (for babies). A CLS, MD and RN are all trained in phlebotomy as part of their scope of practice but phlebotomists are usually employed to do routine blood collections. As far as being transfused if necessary you, B pos, would receive packed RBCs from a type B pos or neg person after that unit has been screened for a variety of diseases. You could also get type O pos or neg packed cells. Plasma wise you would recieve type B or type AB plasma. Same with platelets. The ethnicity of the donor is not known to us who are doing the work on the bench. The CLS just does their best to prepare a suitable unit for transfusion. I’ve been doing this for > 35 years and I’ve never been in a situation where information about the ethnicity of the donor was required. However, the donors ethnicity would be useful when selecting units that are being screened for certain antigens. Some antigenic combinations are more common or uncommon in certain ethnic groups. This info would make it easier to find a suitable unit for a patient with a difficult antibody profile for example. But this is usually done at the Blood Bank and not at a hospital lab bench.