QUALITY OF FACTOR XI ACTIVITY TESTING IN NORTH AMERICAN SPECIALIZED COAGULATION LABORATORIES

¹Department of Laboratory Medicine and Pathology, University of Minnesota Minneapolis, MN, USA,²Department of Pathology/Laboratory Medicine, Hofstra North Shore-Long Island Jewish School of Medicine Lake Success, NY, USA,³ECAT Foundation Voorschoten Netherlands,⁴Department of Laboratory Medicine and Pathology, Mayo Clinic Rochester, MN, USA,⁵Department of Pathology and Laboratory Medicine, University of Rochester School of Medicine and Dentistry Rochester, NY, USA,⁶Department of Pathology, University of Utah, ARUP Laboratories Salt Lake City, UT, USA,⁷Department of Pathology, Massachusetts General Hospital Boston, MA, USA