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Pseudothrombocytopenia induced by a monoclonal IgM kappa platelet agglutinin
1Department of Internal Medicine, University of Arizona Health Sciences Center, College of Medicine, Tucson 85724.
American Journal of Hematology
|May 1, 1989
Abstract:
Pseudothrombocytopenia is an in vitro phenomenon usually associated with anticoagulant (EDTA)-dependent IgG platelet agglutinins. A low Coulter platelet count was investigated in a 63-year-old woman with multiple sclerosis and a monoclonal IgM kappa gammopathy. An unusual type of EDTA- and temperature-independent IgM platelet agglutinin was identified by in vitro agglutination of donor platelets and was removed by immunoabsorption.