D-dimer is 2.2mg/l, the value is high, but it only means that there is a risk of thrombosis, it does not mean that there is a thrombus. D-dimer can reflect the function of fibrinolysis, the normal value is <0.3mg/L or <0.5mg/l, the high value indicates that the body's fibrinolytic activity is enhanced, which is seen in disseminated intravascular coagulation, deep vein thrombosis, acute infarction, pulmonary embolism, tumors, infections, surgical trauma, etc., so that the elevation of D-dimer only means that the risk of thrombus formation is increased. Thrombus is an abnormal coagulation in the blood, which can be composed of insoluble fibrinogen, platelets, deposited red and white blood cells, etc. It can occur in all parts of the body, such as cardiogenic thrombosis, deep vein thrombosis of the lower extremities, etc. When the fibrinolytic activity is enhanced, the risk of thrombus formation is increased. When thrombosis occurs, D-dimer is generally elevated. However, when D-dimer is elevated, it does not necessarily mean thrombosis, but may also be caused by other causes. It is recommended to consult a doctor in time to clarify the diagnosis and actively carry out standardized treatment to avoid delaying the course of the disease.