The absence of end-diastolic flow signal in the umbilical artery indicates that there is a problem in the circulation of the umbilical cord and there is a possibility of fetal asphyxia. The absence of end-diastolic blood flow signal in the umbilical artery is commonly seen in umbilical cord abnormalities, such as the umbilical cord is wrapped around the neck, too thin, knotted, twisted, and so on, which may cause fetal hypoxia, and need to be combined with the fetal heart rate and fetal development to make a comprehensive judgment. You should pay attention to review and observe the umbilical cord. Sometimes, if the fetus keeps rotating, the umbilical cord may be untwisted. If the doctor judges that it can be observed first, the pregnant woman must observe the fetal movement. If the fetus suffers from hypoxia, it will cause abnormal fetal movement. If the fetal movement is less than 3~5 times per hour, consult a doctor promptly. Throughout the pregnancy, you should strictly follow the doctor’s instructions to do a good maternity examination, if there is any abnormality, you need to consult a doctor in time.