[Multiple myeloma with hemolytic anemia and thrombocytopenia].

We report a 59 year old female patient who was diagnosed as having IgG kappa myeloma with hemolytic anemia and thrombocytopenia simultaneously. Although M-protein was suspected to contribute to the hemolysis, the IgG purified from the patient's serum did not bind to red blood cells. Therefore, massive non-specific binding of M-protein to blood cells might contribute to high levels of red blood cell-associated IgG and platelet-associated IgG in the patient.