A patient with autoimmune hemolytic anemia of the warm antibody type developed a hyperacute hemolytic crisis with acute renal failure under conventional treatment with corticosteroids. Because of the life-threatening situation it was decided to start a combined treatment with immunosuppression and plasmapheresis. Already after the first plasma exchange the direct antiglobulin test became weakly positive, the hemoglobin level rose from 4.1 to 8.1 g/dl, and the hemolytic crisis subsided. Four more exchanges were performed; thereafter, the patient’s clinical condition and laboratory data stabilized.