During pregnancy, pregnant mothers need to do many large and small prenatal examinations. One of the most important examinations is the four-dimensional large exclusion. This examination can effectively help pregnant mothers to know whether the baby in their stomachs is abnormal, and help doctors to judge whether the fetus is abnormal. However, what pregnant mothers may not know is that four-dimensional color Doppler ultrasound is not a panacea, and it cannot completely detect all fetal malformations. Regarding the four dimensions, pregnant mothers must understand these things in advance.

1. What is four-dimensional exclusion?

The so-called four-dimensional large-scale ovulation is a name that we usually do four-dimensional color Doppler ultrasound for pregnant women. The four-dimensional color Doppler diagnostic instrument is mainly used to detect the development of the fetus in the mother. It can display the real-time moving images of the fetus in the mother's body or other human organs, and can know the sex, development and abnormality of the fetus through four-dimensional color Doppler ultrasound.

second, what problems can be detected by four-dimensional large row deformity?

Four-dimensional large-scale rejection is mainly aimed at systematically screening the face, nervous system, digestive system, urinary system, heart, limbs and umbilical cord of the fetus, which can check whether the fetus has cleft lip and palate, entropion, anencephaly, hydrocephalus, spina bifida and other malformations.

Third, what should pregnant mothers pay attention to when doing four-dimensional ovulation?

1. Select the best inspection time. The best time for pregnant mothers to do four-dimensional large ovulation is within 24 ~ 28 weeks of pregnancy. If it is less than or greater than these gestational weeks, some fetal problems will not be easily found. Many hospitals need to make an appointment in advance for the time of four-dimensional color Doppler ultrasound. Under normal circumstances, the number can be posted online. Pregnant mothers should know clearly in advance and don't miss the best examination time.

2, check, it is best to choose the time of frequent fetal movement. If the fetus happens to be asleep when doing four-dimensional color Doppler ultrasound, then some parts are likely to be invisible. Pregnant mothers can take some chocolates with them when they go to do four-dimensional color Doppler ultrasound. If the fetus is still during the examination, you can eat something to remind him that it is time to get up. You should know that the fetus is not active when the pregnant mother is in the street, so be prepared. Remember to eat before the pregnant mother goes to check, and prepare some snacks in the bag!

3, four-dimensional can not completely rule out fetal heart abnormalities. Conditional pregnant mothers had better do an echocardiographic examination of fetal heart. This is especially important for pregnant women with congenital heart disease, advanced age, obesity and family history of diabetes.

what are the limitations of 4-D and 4-D large ovulation?

1. The examination results are influenced by many factors such as fetal position, amniotic fluid and fetal activity. Many organs or parts of the fetus may not be displayed or displayed clearly. This has led many pregnant mothers to do four-dimensional color Doppler ultrasound several times before they can pass. When the fetus doesn't cooperate, the doctor will ask the pregnant mother to go out for a walk and come back to continue.

2. Fetal malformation is a dynamic development process. If it does not develop to a certain extent, it may not be detected. Some deformities can only be displayed at certain times. Therefore, four-dimensional color Doppler ultrasound examination can only show the current fetal development, and can not predict the future.

3. I-degree cleft lip, simple cleft palate, the shape of ears, hands and feet, the number of fingers and toes, chromosome abnormalities and so on cannot be detected in four dimensions.

4. In view of the complicated fetal heart structure and various congenital heart diseases, the exclusion rate of four-dimensional large-exclusion malformation for the heart malformation of Zhongda University is about 7% ~ 8%.

before doing four-dimensional ovulation, pregnant mothers must understand these four things. In addition, pregnant mothers must cooperate with doctors when doing four-dimensional color Doppler ultrasound, so that the results will be more accurate.