Used in clinical hematology as well as various kinds of blood cell test instruments. It makes use of EDTA K2/ EDTA K3 as an anticoagulant. Meanwhile, it offers comprehensive protection for blood cell, especially for protecting the blood platelet, so that it can effectively stop the gathering of blood platelet and makes the form and volume of blood cells uninfluenced for a long time. EDTA tube can be used in direct sampling analyzers without actually being opened.