Rh factor Rh-negative Rh-positive Rh-type Rhesus factor antibody antigen arterial blood blood blood bank blood cell blood count blood donor blood donor center blood group blood grouping blood picture blood platelet blood pressure blood serum blood substitute bloodmobile bloodstream circulation clinical dextran dextran erythrocyte globulin gore grume hematics hematologist hematology hematoscope hematoscopy hemocyte hemoglobin hemometer humor ichor isoantibody leukocyte lifeblood neutrophil opsonin phagocyte plasma plasma substitute red corpuscle serum type O venous blood