Single umbilical artery can usually be detected during routine pregnancy tests performed between 12 and 22 weeks of pregnancy. Pregnant women can confirm the presence of abnormal umbilical vessels and single umbilical artery during routine pregnancy tests such as mid-pregnancy ultrasound, 4D ultrasound, and fetal screening tests. These tests are distributed between 12-22 weeks of pregnancy respectively. A single umbilical artery means that there is only one umbilical artery; a normal umbilical cord contains two umbilical arteries and one umbilical vein. If single umbilical artery is diagnosed, you need to follow the doctor’s instructions to complete other tests to confirm the growth of the fetus, and if necessary, you need to cooperate with the doctor’s treatment to ensure that the pregnancy goes smoothly. Pregnant women need to maintain a good routine, reasonable diet, nutrition, and maintain a happy mood, in order to be conducive to the fetus and their own health.