BD Vacutainer Plasma tubes contain Sodium Heparin which is used to obtain a plasma sample. The tubes are available in a range of sizes in plastic and can be identified by a green cap. The concentration of the Sodium Heparin additive in BD Vacutainer Plasma tubes is 17 International Units of Heparin/ml of blood. The additive in the tube is spray coated on the inner wall. The BD Vacutainer Heparin tubes can be centrifuged immediately after collection.