Human-Derived D-Dimer for External Quality Assessment

External quality assessment (EQA) of D-dimer assays has been limited by a lack of standardized human-derived testing material. In 2006 and 2007, the Quality Management Program--Laboratory Services, Toronto, Canada, investigated the use of commercially prepared lyophilized human plasma spiked with human-derived D-dimer components manufactured by Affinity Biologicals, Hamilton, Canada. Four surveys were performed. Participants reported the level …