The amount of D-2 polymer that is considered high in a pregnant woman depends on the time of the pregnancy. In early pregnancy, it is usually less than 1.0mg/L, in mid-pregnancy less than 1.0mg/L, and in late pregnancy less than 3.0mg/L. If it exceeds this upper limit, the D-2 polymer is considered high. D-2 polymer is an important indicator of the body’s blood clotting function, and this test can be used to determine whether there is a risk of thrombophilia. A woman’s blood is in a state of hypercoagulability throughout her pregnancy, and D-2 polymer will increase with the length of the pregnancy. If the D-2 polymer is above 3mg/L in late pregnancy, it should also be combined with other indicators to determine whether there is a risk of thrombophilia in pregnancy, and be treated as appropriate, with anticoagulant medication if necessary, to prevent the occurrence of thrombophilia. Therefore, when D-2 polymer is found to be high in the labor and delivery test, it is recommended to consult a doctor in time.