This issue of “Progress in Medicine” has been prepared by the Department of Immunohaematology in Centre of Postgraduate Medical Education in cooperation with authors from the Clinical Department of Pediatrics, Haematology and Oncology, Medical University of Warsaw, the Clinical Department of Pediatrics in our Centre and the Institute of Haematology and Blood Transfusion. It is dedicated to the problems of haematology and immunology which are the subject of studies in the Department of Immunohaematology. Our research concerns congenital and acquired mechanisms of destruction of red blood cells.