✔A vacutainer blood collection tube is a sterile glass or plastic test tube with a colored rubber stopper creating a vacuum seal inside of the tube, facilitating the drawing of a predetermined volume of liquid
✔Vacutainer tubes may contain additives designed to stabilize and preserve the specimen prior to analytical testing
✔Tubes are available with a safety-engineered stopper, with a variety of labeling options and draw volumes
✔The color of the top indicates the additives in the vial.[1]