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High‐Titer, High‐Thermal‐Amplitude Cold Autoagglutinin Not Associated with Hemolytic Anemia

Abstract. An example of an unusual cold autoagglutinin is reported. The antibody was monoclonal IgMKappa able to fix complement, and, in the presence of albumin, had both a high titer (>4,096 at 4 °C) and a wide thermal range (4–37 °C). The patient was closely followed over a 3‐year period with no evidence of hemolysis ever documented, despite a persistently positive direct antiglobulin test and the presence of the cold autoagglutinin. In contrast to previous reports regarding cold‐agglutinin disease, this case demonstrates that in vivo hemolysis is not always associated with cold autoagglutinins that in vitro show a high thermal range in the presence of albumin.