Umbilical blood flow test

Umbilical blood flow examination is to determine the fetal development in the uterus, such as the presence of fetal intrauterine growth retardation, to determine whether there is a tendency to develop hypertension syndrome during pregnancy, to determine whether there is intrauterine hypoxia. Fetal chromosome abnormalities, congenital malformations, and other umbilical blood flow can sometimes show abnormalities. Abnormal umbilical blood flow may also be related to developmental defects and histological abnormalities of the placenta. The normal value is related to the number of weeks of pregnancy. There are mainly three items. The ratio of fetal umbilical artery systolic blood pressure to diastolic blood pressure (S / D) is used as the main indicator, and the S / D value in late pregnancy is less than or equal to 3.0 as the normal value.