BD Vacutainer® PST^TM Tubes contain spray-coated lithium heparin and a polymergel for plasma separation. Samples processed in these tubes are used for plasmadeterminations in chemistry. BD Vacutainer® PST^TM Lithium Heparin Tubes eliminate theneed to wait for a clot to form, making it an ideal tube for STAT procedures, as wellas for patients receiving anticoagulant therapy. They provide the convenience of gelseparation with the added advantage of improved turnaround time.