[Anti-Thrombin IgA in a Patient with Multiple Myeloma Leading to In Vitro Interference in Multiple Coagulation Tests and Confounding Diagnosis].

 Antibodies to human thrombin may interfere with all coagulation assays involving thrombin, imitating a severe coagulopathy. However, in vivo they do not necessarily lead to strongly increased bleeding tendency. Complex and ambiguous coagulation abnormalities should be evaluated and treated in an interdisciplinary setting, including a highly specialized coagulation laboratory, from the beginning.