Improvement of Immunologic and Molecular Techniques for the Diagnosis and Follow-up of Patients With Thrombotic Thrombocytopenic Purpura

"In this study the measurement of ADAMTS13 activity will be assessed with three different commercial kits:~1. HemosIL AcuStar ADAMTS13 Activity Assay (Instrumentation Laboratory, Bedford, Massachusetts, United States)~2. ELISA, DG-EIA ADAMTS13 Activity (Diagnostic Grifols®, Spain)~3. FRETS-VWF73 for ADAMTS13 Activity Assay~Three kits will be used with all patients."