Laboratory test tube

for coagulation analysisbloodserum

Plasma tubes are coated with lithium heparin or sodium heparin to inhibit coagulation. The heparin activates antithrombin, thereby blocking the coagulation cascade and producing a whole blood/plasma sample instead of clotted blood and serum. The lithium assay should not be performed in lithium heparin tubes. Samples collected in these tubes are used for plasma determinations in chemistry.