Plasma tubes with gel contain pulverized lithium heparin and a polymer gel in the bottom for plasma separation.
The specific gravity of this material can cause the barrier gel to rise to the plasma-clot interface during centrifugation and it forms a stable barrier separating the plasma from the cells. Samples processed in these tubes are used for plasma determinations in chemistry. These tubes offer the convenience of gel separation with the added benefit of improved turnaround time.