D-dimer test, the price is usually around 60-80 yuan. D-dimer is a degradation product of human cross-linked fibrin, which is a metabolite specific to secondary fibrinolysis, and normal people are negative for D-dimer. If the D-dimer is positive, the body has symptoms of hyperfibrinolysis, which is commonly seen in diseases such as deep vein thrombosis and pulmonary embolism. At the same time, certain thrombotic diseases may also show increased D-dimer after thrombolytic therapy, such as acute myocardial infarction, cerebral thrombosis, etc. After thrombolytic therapy, D-dimer is significantly increased. In addition, diffuse intravascular coagulation, which stimulates the fibrinolytic and coagulation systems of the body, results in extensive thrombus formation in the small vessels of the body, as well as hyperfibrinolysis, which also results in a significant increase in D-dimer.