High ultrasensitive D-dimer in pregnant women is also known as high ultrasensitive D-dimer. High ultrasensitive D-dimer may be physiological, which is a change in the body to prevent hemorrhage during childbirth, or pathological, which suggests that the body has thrombosis. D-dimer is a specific marker for the fibrinolytic process, derived from fibrinolytic enzymes that dissolve cross-linked fibrin clots, indicating an indicator of coagulation function, which is only slightly high during pregnancy, and is considered to be physiological. As long as there is activated thrombosis and fibrinolytic activity in the blood vessels of the body, D-dimer will be elevated through examination. During pregnancy, in order to prevent hemorrhage during delivery, the blood begins to enter a state of hypercoagulability gradually, which is reflected in the increase of D-dimer, and the more pronounced the higher the increase in the later stages of pregnancy, generally without special treatment. Ultrasensitive D-dimer is very high, suggesting that there is thrombosis in the body, there may be pulmonary embolism, deep vein embolism and other thrombotic diseases or coagulopathies during pregnancy, further CT arteriography and other tests, imaging shows that there is a thromboembolism, anticoagulant treatment, such as heparin under the guidance of the doctor to choose the treatment. Pregnant women with high ultrasensitive D-dimer means what, it is recommended to go to the hospital through the examination to let the doctor judge.