BD Vacutainer Plasma Tubes contain Sodium or Lithium Heparin and are used to obtain a plasma sample. The tubes are are available in both plastic and glass, in sizes 2ml, 4ml and 6ml, and are identified with a green cap. The additive in the plastic plasma tube is spray coated onto the inner wall. BD Vacutainer Heparin tubes can be centrifuged immediately after collection. Specifications Additive: Sodium Heparin 17IU/ml Cap colour: Green Label type: Paper Volume: 6ml Size: 13mm x 100mm