In fact, the number of B-ultrasound during pregnancy varies from person to person, but it generally includes five times.
First check-up: Early pregnancy check-up at 6-7 weeks' gestation.
When you go to the hospital when you are just pregnant, you usually open this checklist. You can determine whether it is intrauterine pregnancy or ectopic pregnancy through B-ultrasound, and then you can determine whether it is singleton or multiple births. According to this examination, you can calculate the pregnancy time and determine the life state of the fetus. (Whether it is a live fetus)
Second examination: NT examination at pregnancy 1 1- 13 weeks +6.
Many people go to do this examination, and they don't know what they are doing until they are told by others. This is the first abnormality check during pregnancy. The thickness of the transparent layer of the fetal neck is measured by B-ultrasound. If the thickness increases, the risk of Down's syndrome can be judged. (Note: This test cannot be used as a disease diagnosis. )
The third examination: a large-scale teratology examination at 20-24 weeks of pregnancy.
Four-dimensional ultrasound examination was performed at 20-24 weeks of pregnancy. At this time, the fetus is the most active, and there is more amniotic fluid. The fetus is neither too big nor too small, just turning around at will in the amniotic fluid, which is convenient for B-ultrasound to observe the fetal structure from various angles.
Malformation screening includes fetal systems, such as skull, limbs, spine and heart, as well as fetal growth and development. Through this examination, we can know whether the fetus has "big structural defects".
The fourth examination: small abnormality examination at about 32 weeks of pregnancy.
There is also a color Doppler ultrasound examination at about 32 weeks of pregnancy, which is more detailed and belongs to the small row abnormality examination. It is mainly to monitor the growth and development of the fetus and whether there are "small structural defects" in the fetus. It is also said that small ovulation is a supplement to large ovulation examination.
Fifth examination: delivery evaluation examination at about 37 weeks' gestation.
This ultrasound examination is mainly to estimate the weight of the fetus, confirm the development of the fetus and determine the mode of delivery. Not all hospitals will do this test.
According to the situation of different pregnant women, the number of B-ultrasound examinations during pregnancy may increase or decrease.
We often say that "there is specialization in the industry", but doctors will tell you if there is a problem during the general checkup. It is difficult to say more when there is no problem. If you can understand it yourself, it is better than holding a piece of "waste paper".
Gestational sac (GS)
Women with regular menstruation before pregnancy can see the gestational sac through B-ultrasound after 35 days of menopause. Generally, the gestational sac is about 2CM in diameter at about 6 weeks of pregnancy and about 5CM at 10 weeks of pregnancy. Gestational sac is often round or oval in shape, which is normal in the front wall, back wall, upper part and middle part of uterus.
Embryo bud (FE)
This can be seen in the B-ultrasound examination in the first trimester of pregnancy. Generally, embryo bud can be seen on the B-ultrasound list of 6 7 weeks of pregnancy.
Head-hip length (CRL)
Head-buttock length, as the name implies, refers to the distance from the top of the fetal head to the buttock, which refers to the outer edge distance. Head-hip length, also known as head-hip distance and top-hip diameter, is generally used to judge the gestational age of a fetus at 7- 12 weeks. This formula can be used to calculate: gestational age (weeks) = head and hip length +6.5(cm).
Fetal head (FH)
Generally, it is normal if the display outline is complete, and it is abnormal if it is displayed as deformation or defect. No displacement of the midline and no hydrocephalus are normal.
Double crown diameter of fetal head (BDP)
The biparietal diameter of fetal head refers to the length of the widest part between the two sides of fetal head, also known as the large transverse diameter of fetal head. After full term, the biparietal diameter can reach 9.3 cm or more.
The biparietal diameter of the fetal head and the age of the fetus can be found regularly. Generally, after 5 months of pregnancy, the biparietal diameter of the fetal head is basically consistent with the month of pregnancy. For example, at 7 months of pregnancy, the BPD is about 7.0 cm. After 8 months of pregnancy, it is normal for the biparietal diameter of fetal head to increase by about 2CM per week on average.
After the second trimester, this data can be used to calculate the fetal weight.
Fetal heart (h)
The fetal heart rate is believed to be one that pregnant mothers know better. Most people know that the normal fetus is between 120 160 times. You know, through B-ultrasound examination, fetal heart beat can be seen as early as 6 weeks.
Femoral length (FL)
Generally, after 20 weeks of pregnancy, this data can be used to check the development of the fetus. Femoral length refers to the length of femur from the root of fetal thigh to the knee, also known as femoral length.
The difference between the normal value of this data and the BPD value of pregnancy month is about 2 3 cm, for example, BPD is 9.3 cm, femur length should be 7.3 cm, and so on.
Spine (SP)
The fetal spine can be seen after 0/2 weeks of pregnancy, but it can be clearly distinguished at 20 weeks of pregnancy. The fetal spine is normal continuously, and the defect is abnormal, which means that there may be spinal deformity.
Fetal movement (FM)
B-ultrasound can see fetal movement at 8 9 weeks of pregnancy. Fetal movement shows that there is or is strong, which means normal; The absence or weakness of fetal movement indicates that the fetus may be sleeping, but it may represent an abnormal situation, which needs to be analyzed in combination with other tests.
Placenta (PL)
Placenta position means the position of the placenta on the uterine wall. The full-term normal placenta thickness is about 2.5 5 cm.
Placental grading (GP)
Placental grading includes three levels, which represent different meanings.
Head circumference (HC)
Refers to the maximum circumference of fetal head from face to back. This data is mainly used to judge the development of the fetus, which is closely related to the binomial diameter of the fetus. The diameter of the double top is long, and the head circumference is large; The shorter the diameter of the double top, the smaller the head circumference.
If the head circumference data is normal, it means that the baby is developing well and is helpful for natural delivery.
Amniotic fluid index (AFI)
Amniotic fluid index is an index that obstetricians pay more attention to. It refers to the value obtained by adding the amniotic fluid depths in four areas.
The normal amniotic fluid index in the third trimester is 818cm. More than18cm means increased amniotic fluid, and less than 8cm means decreased amniotic fluid.
Monitor the resistance index (S/D) of blood flow.
The change of S/D value is an important index to grasp whether the fetal development is normal or not.
Amniotic fluid (AMN)
The vertical amniotic fluid depth (MVP) of the largest sheep pond is between 37cm, with more than 7cm representing increased amniotic fluid and less than 3cm representing decreased amniotic fluid.
Umbilical Cord
Under normal circumstances, the umbilical cord of the fetus should float in the amniotic fluid. If an image of the umbilical cord is seen in the neck of the fetus, it may be that the umbilical cord is around the neck. If the black-and-white gray-scale ultrasound examination report says "impression on the neck", it means that the umbilical cord wraps around the neck.
Some ultrasonic examination lists indicate U-shape, W-shape and pin-shape. There are also some ultrasonic examinations that directly mark the words "the umbilical cord wraps around the neck for one or two weeks".
It is not easy to sort out these data. If pregnant mothers can't read them all at once, it is recommended to collect them for future reference.
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