When is the best time to do B-ultrasound during pregnancy?

　　I was recently diagnosed with BB and need an ultrasound. I heard that B-ultrasound is very important during pregnancy. I would like to know first. When is it specifically done? Are there any circumstances that require additional investigation? Also, is B-ultrasound safe for babies? Will too many tests harm the baby, for example due to radiation or other issues? Is it best not to do any examinations such as X-rays?

　　for monitoring fetus Ultrasound examination during pregnancy is very necessary to prevent growth and reduce the birth of children with deformities and defects. However, many pregnant women do not know enough about ultrasonic examination, which troubles many expectant mothers: "When should we do ultrasound, and how many times should it be done?" ”

　　Normally, ultrasound examinations during pregnancy can be arranged in four stages.

　　1. 7-14 weeks of pregnancy

　　Ultrasound at 7-8 weeks of pregnancy can help determine whether there is an intrauterine pregnancy, but if there is no vaginal bleeding at this stage, stomach ache For abnormal conditions, it is generally recommended that the first ultrasound examination be performed at 11-14 weeks. At this time, ultrasound can be used to measure the crown-rump distance, that is, the distance from the top of the fetus to the bottom of the buttocks, to determine the accurate gestational age and provide standards for the future growth and development of the fetus. In addition, the NT value, which is the fetal neck, can also be measured. skin Translucent layer, combined with gestational age, can determine whether the fetal nuchal translucent layer is thickened. NT thickening can screen fetal chromosomes early. disease , the combination of NT and Down syndrome screening at 16-20 weeks of pregnancy can diagnose most fetal chromosomal diseases.

　　2. 18-24 weeks of pregnancy

　　At this time, the structure of the fetal organs and the amount of amniotic fluid are most suitable for ultrasound examination, and the detection rate of fetal abnormalities is higher. Through fetal structural screening at this stage, the size of the fetus and the development of the fetal head, nasolabial region, spine, heart, lungs, gastrointestinal tract, kidneys, bladder, external genitalia, limbs, placenta, and amniotic fluid can be observed.

　　3. 30-32 weeks of pregnancy

　　The focus of the ultrasound examination during this period is to observe various growth indicators, measure the fetal biparietal diameter, head circumference, femoral length and abdominal circumference, observe whether the fetal growth and development is consistent with the gestational age, understand whether there is developmental delay or fetal macrosomia caused by high-risk diseases during pregnancy, such as hypertension, cholestasis, diabetes, etc., and screen for fetal development abnormalities that only appear in the second and late stages of pregnancy.

　　4. Before delivery

　　The B-ultrasound examination during this period focuses on determining the location and maturity of the placenta, the location of the umbilical cord and the condition of the amniotic fluid, estimating the size of the fetus, and judging the safety of the fetus through the umbilical blood flow. After the doctor understands these situations, he is very concerned about the baby's safe delivery and the mother's health. healthy Peace is very important.

　　Under normal circumstances, 4-5 B-ultrasound examinations according to the above four stages during pregnancy are enough. However, if abnormalities such as abdominal pain, vaginal bleeding, frequent or reduced fetal movements, uneven fetal development, and unclear fetal position occur during pregnancy, the number of examinations needs to be increased according to the doctor's examination.

　　[Information for expectant mothers: Precautions for B-ultrasound during pregnancy]

　　1. B-ultrasound in early pregnancy requires a certain amount of urine to accumulate in the bladder to see clearly, so you need to hold in your urine in advance. After three months of pregnancy, the baby no longer needs to hold in his urine when he grows up, and can do it as he pleases.

　　2. Do not do B-ultrasound on an hungry stomach, especially in the second and third trimesters of pregnancy. If the baby is hungry, the baby will not cooperate. Some data cannot be seen clearly, cannot be measured, or the measured data may be inaccurate.

　　3. During the examination, you should try to relax as much as possible and cooperate with the doctor's examination. If you are too nervous during the examination, it may affect the results of the examination.

　　4. Do not eat foods that are prone to gas production, such as milk, sweet potatoes, etc. before doing B-ultrasound, because this will hinder the penetration of ultrasound and cause unclear imaging of the organs being examined.

　　5. Before the B-ultrasound, touch your belly more often and tell the baby to cooperate obediently, and the baby will cooperate well with the mother.