phlebotomy
noun
                                                                                                                            
                                                            phle·bot·o·my
                    
                                                                                                              
                                                                                                                                  fli-ˈbä-tə-mē  
                                                      
                                                          
            
            
               plural phlebotomies            
        
    
                                
              
          
                                                      : the drawing of blood (as by venipuncture) for transfusion, apheresis, diagnostic testing, or experimental procedures                                      
                
Note: Phlebotomy was once widely used to treat many types of disease but is now limited to the treatment of only a few conditions like hemochromatosis and polycythemia vera.
While scientists struggle to understand the molecular subtleties of hemochromatosis, the clinical treatment of the disorder remains remarkably primitive: serial phlebotomy. That is, weekly bloodletting.— David A. Shaywitz
David A. Shaywitz
                         
                called also venesection
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  Merriam-Webster unabridged




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