Heparin has the effect of potentiating antithrombin inactivation of serine proteases, thereby preventing the formation of thrombin and preventing various anticoagulants such as platelet aggregation. Heparin tube is generally used for the detection of emergency biochemistry and hemorheology. It is the best choice for electrolyte detection. When testing sodium ions in blood samples, Sodium Heparin cannot be used to avoid affecting the test results. It can also not be used for white blood cell counting and classification, because heparin causes leukocyte aggregation.