Question 1 for pregnant moms: Is it safe to do B-ultrasound during pregnancy?
Ultrasound examination is a non-invasive imaging technology that is suitable for diagnosing pregnancy, monitoring fetal development, detecting certain structural abnormalities of the fetus, and understanding the condition of the placenta and amniotic fluid. As reported in the available scientific literature, diagnostic dose ultrasonography did not detect irreversible damage to the embryo. B-ultrasound examination is a must-have examination for pregnant mothers during pregnancy. This is an energy test without X-rays or ionizing radiation. In terms of the wave volume and exposure time used in clinical ultrasound examination of pregnant women, its safety is safe. It can ensure that pregnant mothers do not suffer psychological burden because of this, and a healthy mentality is beneficial to the health of mother and child.
Question 2 for pregnant moms: How many B-ultrasound examinations should be done during pregnancy?
Among the 12 prenatal examination items stipulated in the current maternity medical insurance, the number of B-ultrasound examinations is 5, which is also the number of B-ultrasound examinations during pregnancy uniformly stipulated by the Municipal Health Bureau. The five B-ultrasound examinations during pregnancy are only the number of examinations that a generally healthy and normal pregnant woman needs. If special pathological conditions are encountered, such as fetal growth restriction, intrauterine hypoxia, fetal malformation, polyhydramnios or oligohydramnios, etc., the doctor will also increase the number of medically required B-ultrasound examinations based on the actual clinical situation.
Question 3 for pregnant mothers: When is the most appropriate time to do each B-ultrasound examination?
It is very important to choose the appropriate time for B-ultrasound examination, because screening for some diseases has strict time limits.
The first B-ultrasound examination should be completed within 3 months, and the best examination time is the 8th week. The main function is to determine the gestational age, whether there is intrauterine pregnancy, and check the NT thickness of the neck (four-dimensional color ultrasound only). According to research data, during this period, by checking the NT thickness of the neck, combined with Down syndrome screening, the detection rate of fetal congenital stupidity can be as high as 80%.
The time for the second B-ultrasound examination is 20-26 weeks. This period is the time for abnormal examination. Generally, through three-dimensional or four-dimensional color Doppler ultrasound examination, most abnormalities of the fetus can be detected, such as face, limbs, brain, internal organs, heart, etc. Malformations, etc.
The third B-ultrasound examination is at 30-32 weeks. It is used to supplement the examination of abnormalities and fetal growth and development, and check whether the fetus has growth restriction, amniotic fluid, umbilical cord, etc.
The fourth and fifth B-ultrasound examinations are performed at 37 weeks and 39 weeks of pregnancy respectively. They have the same function. They are to check the maturity of the placenta and the growth and development of the fetus. They do not involve fetal structural examination. If there is no umbilical cord around the neck during this period, you can choose a black and white B-ultrasound. If the umbilical cord is wrapped around the neck, your doctor may recommend a color Doppler ultrasound to check the blood flow in the umbilical artery.
Question 4 for pregnant mothers: Are the results of B-ultrasound examination completely reliable?
No ultrasound doctor will tell a pregnant woman that your ultrasound results are normal and that the fetus is healthy and there is nothing wrong with it. why is it like this? Prenatal ultrasound cannot detect all fetusesChildren with deformities.
Ultrasound examination is an indirect examination method and has certain limitations. Prenatal diagnosis cannot be completely equated with postnatal diagnosis. Many factors will affect the accuracy of ultrasound diagnosis of fetal malformations, such as cesarean section scarred uterus, maternal abdominal wall laxity and hypertrophy, pregnancy month, fetal position, fetal movement, bone sound shadow, polyhydramnios or oligohydramnios, etc. In addition, during the development of the fetus during pregnancy, different malformations will appear at different times, and some malformations may not appear until after birth. In this regard, pregnant mothers should respect science objectively and rationally.