Umbilical artery sd 3.4 at 32 weeks is within the normal range. Umbilical artery S/D ratio, also known as umbilical artery blood flow velocity peak-to-valley ratio, refers to the ratio of the maximum systolic blood flow velocity to the end-diastolic blood flow velocity of the umbilical artery. Too high an indicator suggests that the fetus may be in fetal distress, umbilical cord around the neck and other abnormalities. The normal value of the umbilical artery in a 32-week pregnancy is 1.84 to 3.87, and generally the larger the gestational week, the smaller the sd ratio of the umbilical artery. If the week of pregnancy increases, the sd ratio value does not decrease but rises, it means that the blood supply of the umbilical artery of the fetus is poor, the fetus may be in a state of hypoxia, you should consult a doctor in a timely manner, and under the guidance of the doctor through the inhalation of oxygen to make the sd ratio back to normal. If the sd value of the umbilical artery is found to be high, one should consult a doctor in time and do fetal heart rate monitoring and so on under the doctor’s guidance to understand the development of the fetus. If fetal hypoxia is found, oxygen should be administered as soon as possible. At the same time, it is also necessary to improve the living environment of pregnant women, the environment air should be clear, avoid living in some more closed room. It is recommended that any abnormalities during pregnancy should be treated by a doctor in time, so as not to delay the condition.