URI Lithium Heparin Tubes are spray-coated with Lithium Heparin. The anticoagulant heparin activates anti-thrombin which block the coagulation cascade and produce a whole blood / plasma sample instead of clotted blood plus serum. Heparin Tubes are used to collect plasma for biochemistry determinations. Sản phẩm tiệt trùng (URN-URS) và không tiệt trùng (URA-URB).