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Curdia Vacuum Blood Collection tube is a Sterile Plastic Test tube with coloured Cap and Rubber Stopper that creates a Vacuum Seal inside the tube. This Vacuum Facilitates the drawing of a predetermined volume of liquid, most commonly blood samples directly from the Vein. Vacutainer tubes may contain additives designed to stabilize and Preserve the specimen prior to analytical testing. Vacuum blood collection tubes are essential tools in healthcare settings for collecting blood samples. These tubes are made of plastic and have a vacuum inside, creating a negative pressure that automatically draws blood into the tube when the needle is inserted into a vein.