Normal D-dimer value is <0.5mg/L, 1.31mg/L is abnormal and high. D-dimer is a fibrinogen degradation product, which is mainly used to detect the body's coagulation function. If the expression of d-dimer is elevated it indicates that a hypercoagulable state of the blood is likely to occur. It is common in thrombotic diseases, such as venous thrombosis, extensive intravascular coagulation or pulmonary embolism, etc. The higher the d-dimer, the more serious the condition. If the elevated D-dimer is caused by a blood clot, thrombolytic therapy should be taken promptly to improve the hypercoagulable state of the blood, and drugs such as warfarin and heparin should be taken as prescribed by the doctor for relief. Elevated D-dimer can be caused by a variety of conditions, so once this happens, you should go to the hospital in time to determine the cause of the disease and then symptomatic treatment, so as not to delay the condition.