After pregnancy, for the health of the fetus and pregnant women, women will do some necessary pregnancy checks, including B-ultrasound. B-ultrasound is a non-invasive imaging technique. It has good results in diagnosing pregnancy, monitoring fetal development, detecting some fetal structural abnormalities, and understanding the condition of placenta and amniotic fluid. But today, there are still some People do not understand B-ultrasound, and even think that B-ultrasound may have a certain impact on the fetus. In fact, this cognition is not correct.
Is it safe to have a B-ultrasound during pregnancy?
ultrasound examination for pregnant women uses the wave volume and exposure time, which will not cause harm to the fetus and the pregnant woman. Safety can still be guaranteed. There is no X-ray and ionizing radiation According to the existing scientific literature, there is no risk of overdosing the embryos.
How many B-ultrasounds should be done during pregnancy?
Usually a woman needs to undergo 12 birth checkups after pregnancy, including 5 B-ultrasound checks. The frequency of B-ultrasound examinations will be increased only when special circumstances are encountered, such as fetal growth restriction , intrauterine hypoxia, fetal malformations, and so on.
When should the B-scan be done?
1. The first B-ultrasound is within three months
The first B-ultrasound is best arranged in the 8th week of pregnancy. It can be judged whether it is intrauterine pregnancy or not. Gestational week, and check the thickness of the neck nt, at the same time,Combined with Down's screening, the detection rate of fetal congenital stupidity can be increased. At this time, the B-ultrasound examination must hold the urine.
2. The second ultrasound examination time is 20~26 weeks
B ultrasound examination during this time period is to rule out fetal malformations, either three-dimensional or four-dimensional. Can detect most fetal malformations, such as facial, limbs, brain, internal organs, organs, heart malformations, etc., reducing the chance of birth of deformed children.
3. The third ultrasound examination is 30~32 weeks
This examination can help the growth and development of the fetus. It can rule out abnormalities and abnormalities in the growth and development of the fetus. , You can also find out whether there is fetal growth restriction, amniotic fluid and specific conditions of expectation in time.
4. The 4th and 5th B-ultrasounds were performed at 37 and 39 weeks respectively
The effects of the 4th and 5th B-ultrasounds It's the same, all to check the maturity of the placenta and the growth and development of the fetus, but it does not include the structure of the fetus, that is, gender. If the umbilical cord around the neck is not found in the previous examination, you can choose black and white ultrasound, but if the umbilical cord around the neck has appeared before, you need to use color Doppler ultrasound for umbilical artery blood flow examination.
Warm reminder
Although B-ultrasonic examination can make more accurate detection for many abnormal situations,But this is only a medical aid and cannot be used as a diagnosis result. Even if a B-ultrasound is performed at the correct time, there may be malformations, because other factors will affect the accuracy of ultrasound 's diagnosis of fetal malformations, such as pregnancy month, fetal position and activity, etc. Therefore, after pregnancy, women should not only do necessary prenatal check-ups, but also pay attention to life details, such as not smoking or drinking, and taking folic acid tablets in the first three months of pregnancy and three months after pregnancy.
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