Objective To investigate the changes of blood coagulation indexes before and after cesarean section in pregnant women with prethrombotic state. Methods Totally 66 cases with prethrombotic state in the diagnosis of snowstorm signby ultrasound were enrolled,compared with the same period hospitalized pregnant women in 66 cases of normal lower limb venous ultrasound. The prothrombin time( PT) and activated partial thromboplastin time( APTT),thrombin time( TT),fibrin original( FBG) and D dimer( DD) in the two gr...