BD Vacutainer Sodium Heparin 4 mL Blood Collection Tubes 13mm x 75mm 100/PackBD 367871 Vacutainer Plastic Heparin Tubes are used for plasma determinations in chemistry. The Tubes have a sodium heparin spray coated at inner surface. Tube inversions allow mixing blood with the anticoagulant and prevent clotting. Evacuated blood collection tubes with heparin are used for plasma determination in chemistry Tubes are sterile Blood is drawn directly from the vein into the evacuated sterile collection tubes Only one venipuncture is