A coagulation composite index CI below -3 is a low coagulation state and prone to bleeding; a coagulation composite index CI above 3 is a high coagulation state and prone to thrombosis. Reactive coagulation is an indicator in thromboelastography. The thromboelastography test was invented by German Hartert in 1948 to measure coagulation by collecting whole blood samples. The principle is based on the fact that the end result of the coagulation process is the formation of a clot, and the physical properties of the clot (formation rate, clot strength and stability) determine whether it has normal coagulation. It is currently used for dynamic detection of coagulation in patients undergoing liver transplantation and extracorporeal circulation, and has been widely used in emergency severe trauma, ruptured ectopic pregnancy bleeding or massive postpartum bleeding, gastrointestinal hemorrhage, and other diseases where severe coagulation dysfunction may occur.