Heparin Tube

Usage: The interior of the tube wall is coated with lithium heparin or sodium heparin. The anticoagulant heparin activates antithrombins and thus blocks the coagulation cascade and prolong the clotting time. The tubes are used for collection and anticoagulation of specimens in clinical biochemistry and emergency biochemical tests (hematology rheology determination, biochemistry, genetic diagnosis, enzymology and ELISA tests). Immediately after blood collection, invert the tube gently for 5-8 times. 

Limitations: These tubes are not suitable for coagulation tests; excessive heparin can cause leukocyte aggregation and thus these tubes should not be used for tests of white blood cell counts. The additive will make the background of blood film stained with a light blue color and thus the tubes are not suitable for morphology examination.