Blood Collection Tube



With the Vaku-8 evacuated tube system, the blood is collected directly into the tube during the venipuncture procedure and is a closed system. With the syringe method, the blood from the syringe must be transferred into test tubes after collection and is an open system.

This convenient system eliminates the need for syringes in many cases and reduces risky blood exposers to phlebotomist and need to transfer blood to test tubes by Lab technicians and consists of disposable needles and tubes. Evacuated tubes are made of glass or plastic and come in various sizes ranging from 2 to 10 ml. Evacuated tubes mayor may not contain additives. Blood collected in tubes without additives will clot and yield serum on centrifugation. Tubes that contain additives mayor may not clot, depending upon the type of additive they contain and makes testing more rapid and accurate compared to open blood collection and testing.


An anticoagulant is a substance that prevents blood from coagulating or clotting. If an insufficient amount of blood is collected in a tube with anticoagulant, the laboratory test results may be erroneous because of an incorrect blood-to-anticoagulant ratio. The blood collection vacuum tubes have been designed for a certain amount of blood to be drawn into the tube by vacuum according to the amount of pre-filled anticoagulant in the tube.