exchange transfusion
noun
                                                                                                                            
                                                            ex·change transfusion
                    
                                                                                                              
                                                                                                                                  iks-ˈchānj- 
                                                      
                                                          
            
                                
              
          
                                                      : simultaneous withdrawal of the recipient's blood and transfusion with the donor's blood especially in the treatment of erythroblastosis                                      
                
                    
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  Merriam-Webster unabridged




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