ADAMTS13 and Venous thrombosis: According to the 2014-2 survey of the External Quality Control for Assays and Tests with a focus on Thrombosis and Haemostasis (ECAT Foundation), the majority of participants (43/70) (61%) use ELISA method in ADAMTS-13 activity measurement with 13% coefficient of variation (CV); most of them (36/43) use the Technoclone Technozyme ADAMTS-13 activity kit.