BD Vacutainer PST II Tube 8ml with Light Green Hemogard Closure (Pack of 100) BD Vacutainer PST II Tubes are used to separate a plasma sample. They contain Lithium Heparin to prevent coagulation and an acrylic gel that forms a barrier between the cells and plasma during centrifugation. Available in sizes 3ml, 4.5ml, 8ml. Specifications: • Additive: Lithium Heparin17IU/ml / Gel • Cap colour: Light Green • Label type: Block • Volume: 8ml • Size: 16mm x 100mm