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Specifications: Material: Plastic Chemical: 9NC Coagulation sod. cit. 3.2% Cap Colour: light blue Ring colour: black Filling volume (ml): 2 Sterile: sterile Qty / inner pack: 100 Description: PT tube is used for blood coagulation test and applicable to fibrinolytic system. The nixing ratio is 1 part citrate to 9 parts blood. Accurate ratio can guarantee effectivity of thte testing result and avoid misdiagnosis. It is also used for blood storage. Do draw sufficient blood volume to ensure accurate testing result.