PocTell® Sodium and Lithium heparin tube, often referred to as a green top, is a specialized blood collection device employed in medical and laboratory environments. It houses heparin, a unique anticoagulant that thwarts blood clotting by impeding the action of clotting factors within the sample.
Composition and Identification
Constructed from glass or PET, these tubes are distinguishable by their green - colored caps, which signal the presence of heparin. The green color - coding serves as a quick visual cue for healthcare workers, enabling them to select the appropriate tube for collection and ensuring it aligns with specific lab test requirements.
Anticoagulant Mechanism
Upon collecting a blood sample into a heparin tube, heparin exerts its anticoagulant effect. It inhibits thrombin, a pivotal enzyme in the blood - clotting cascade. By doing so, it keeps the blood in a liquid state, a prerequisite for certain lab tests that demand whole blood or plasma samples.
Types of Heparin and Variations
Notably, there are different heparin variants, including unfractionated heparin and low - molecular - weight heparin (LMWH). The type and concentration of heparin in the tube can differ based on the intended use and the specific protocols of the laboratory.
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