Hemolytic warm IgM autoagglutinins in autoimmune hemolytic anemia

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Abstract
The authors report a patient with fulminant autoimmune hemolytic anemia due to a rare warm IgM autoagglutinin more reactive at 37.degree.C than at lower temperature and secondary to systemic lupus erythematosis. The patient''s clinical course and the serologic and immunochemical characteristics of the antibody are described, including the possibility that transfusions of small amounts of incompatible red cells may have contributed to the hemolysis. The consequences of using the initial serologic test results as the basis for therapy are discussed.