Mother Chen, I have been pregnant for 23 weeks, do I need a cord blood flow test?
In order to ensure the health of the mother and the fetus and the normal development of the baby during pregnancy, there are many inspections that need to be done. Generally, the umbilical blood flow inspection can be done after 20 weeks of pregnancy, which is also one of the inspection items. Umbilical blood flow refers to the blood flow in the umbilical cord. The umbilical cord generally includes three blood vessels, two of which are arteries and one is a vein. Umbilical blood flow reflects the conditions of these three blood vessels. Blood flow is generally expressed by S/D. S generally refers to blood flow velocity during systole, and D generally refers to blood flow velocity during diastole. This value reflects the resistance of umbilical cord blood flow. The higher the value, the greater the blood flow resistance, the slower the speed.
S/D is related to the gestational week under normal circumstances, and cannot be greater than the maximum value of the reference range of the corresponding gestational week. If it is greater than the maximum value of the reference range of the corresponding gestational week, it often indicates blood If the flow is slow, the fetus may have hypoxia or insufficient blood supply, which may cause fetal growth and development. Therefore, you must pay attention to whether the cord blood flow is normal when doing b-ultrasound during pregnancy. If it is abnormal, check the cause in time.
Generally, it is of little significance to detect cord blood flow before 20 weeks. As the gestational age increases, cord blood flow shows a downward trend. The normal value of cord blood flow at 24 weeks has an average value of 3.5 and an upper limit of 4.25. Exceeding the upper limit is abnormal. S/D should be less than 3 after 28 weeks of gestation. From 25 to 41 weeks of gestation, the S/D ratio of most pregnant mothers almost linearly drops from 2.8 to about 2.2. Generally, the S/D value in the third trimester of pregnancy is less than or equal to 3.0...it is normal.
Umbilical blood flow check is only one aspect of fetal development. In many cases, it is necessary to comprehensively evaluate and judge according to various situations. It is not an absolute judgment based on this item alone. Fetal hypoxia, because the umbilical blood flow detection value and its accuracy are also affected by many factors, such as the weight of the fetus, the condition of the placenta, the location of the measurement, etc., if the third trimester increases with the gestational week , S/D ratio did not decrease regularly, but increased instead. This means that there may be fetal dysplasia, intrauterine hypoxia, and umbilical cord around the neck. If it is just a little bit higher, it can actually be treated without treatment. Just observe it. The most important thing is to listen to the doctor’s advice.
You can have a cord blood flow test at 23 weeks of pregnancy!
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