Fibrinogen is a routine blood coagulation test that is measured by drawing peripheral venous blood, with normal values ranging from 2-4 g/L. Of course, the normal range of values may vary from hospital to hospital, with some normal values set at 1.5-3.5 g/L. Fibrinogen is a glycoprotein synthesized in the liver that promotes platelet aggregation, smooth muscle and endothelial cell growth, increases blood viscosity and peripheral resistance, and promotes red blood cell adhesion and thrombosis, smooth muscle and endothelial cell growth, increase blood viscosity and peripheral resistance, and promote red blood cell adhesion and thrombosis. Its value reflects not only the degree of liver damage but also the thrombotic state of the body, and is a risk factor and a predictor of many diseases. Elevated fibrinogen is mainly seen in diabetes, acidosis, atherosclerosis, acute infectious diseases, acute nephritis, uremia, myelopathy, shock, and post-surgery, while decreased fibrinogen is mainly seen in disseminated intravascular coagulation, primary fibrinolysis, severe hepatitis, and liver cirrhosis. Elevated fibrinogen values are not necessarily the result of disease, but can also be caused by physiological factors, such as advanced age and use of contraceptive drugs.