Abstract: Umbilical artery blood flow monitoring is widely used in obstetrics as a non-invasive method for evaluating fetal placental hemodynamics. Umbilical artery doppler blood flow waveform mainly reflects the vascular resistance of placenta，which is affected by the development of villous blood vessels. Meanwhile，gestational age，fetal heart rate，fetal respiration and hiccup，fetal movement，sampling position of umbilical cord，fetal sex，placental weight and fetal weight also have certain influence .Evidence-based medical evidence recommends umbilical artery Doppler ultrasound as  fetal monitoring method for fetal growth restriction and twin selective growth restriction. The significance of umbilical artery blood flow monitoring in low-risk populations remains controversial. Absence of end-diastolic blood flow or end-diastolic reflux is significantly associated with significantly poor perinatal outcomes，and care should be taken to exclude congenital abnormalities and aneuploidy of the fetus. Obstetric management of abnormal umbilical artery blood flow depends on the severity of the abnormal umbilical artery Doppler findings，the severity of the underlying obstetric complications，and the gestational age，which should be given individualized management.

Key words: umbilical artery blood flow, fetal growth restriction, selective fetal growth restriction, absence of end-diastolic flow velocity（AEDV）

摘要： 脐动脉血流监测做为非侵入性的胎儿胎盘血流动力学评估方法，广泛应用于产科临床。脐动脉多普勒血流波形主要反映胎盘的血管阻力，受绒毛血管发育状况的影响。同时，胎龄、胎儿心率、胎儿呼吸和呃逆、胎动、脐带的采样位置、胎儿性别、胎盘重量及胎儿体重等也对其有一定的影响。循证医学证据推荐将脐动脉超声多普勒检测作为胎儿生长受限及双胎选择性生长受限的胎儿监测。在低危人群中，脐动脉血流监测的意义还存在很多争议。舒张末期血流缺失或反向与围产期结局显著不良相关，需注意排除胎儿先天性异常及非整倍体异常。脐动脉血流异常的产科处理取决于脐动脉多普勒检查结果异常的严重程度、基础产科并发症的严重程度以及孕周，应个体化处理。

关键词: 脐动脉血流, 胎儿生长受限, 选择性胎儿生长受限, 舒张末期血流缺失