Improved performance and more sample yield for laboratory procedures requiring serum Contains a positive gel barrier between blood cells and serum Interior silicone glass powder activates the clotting of blood Sterilization applies to the tube and stopper interior only, and not to the outside of the tube or to the packaging; tubes are sterilized by gamma radiation Crown Corvac™ gel placement for improved performance and more sample yield TDM compatible Allows for sensitive and routine pharmacokinetic testing Plastic coating prevents tube cracking Can be used with both angle-head and horizontal-head centrifuges Laboratory procedures requiring serum with a positive gel barrier between blood cells and serum; general chemistry, serology and toxicology procedures