How many B -ultrasounds do you need to do during pregnancy?Gynecologist tells you the answer!

"Doctor, my menstruation is postponed. I just tested two bars myself just now. I want to do the B -ultrasound."

"How many days have been postponed?"

"It’s about 5 days."


(Nani, the duty is already busy, can the sisters come to trouble, but can only continue to say without changing the color)

"Well, you can’t see the B -ultrasound at this moment. It is recommended that you come again at least a week later. If you have bleeding or other symptoms …"

The above conversation is the daily life of our gynecologist Fang Huibin, and we probably appear in gynecological outpatients every day.

Today we will ask Dr. Fang to talk briefly. In relatively normal situation, how many B -ultrasounds do you have to do during pregnancy, when are you doing and what is the purpose.

The first time: 50 days before menopause (menstrual abdomen/vaginal B -ultrasound)

The first B -ultrasound during early pregnancy is generally calculated before and after 50 days of menopause (knocking on the blackboard, starting from the first day of the last menstruation, not the number of days delayed).

The main purpose is to understand the position of the embryo bed. It is determined whether it is normal internal pregnancy or ectopic pregnancy.If the cesarean section has been done before, whether it is planted in the scar position.

The second is the preliminary calculation of the gestational week. This time, whether the ovulation is as usual, is there any existence of a lot of advance or postponing a lot of situations.

If the difference is more than a week, the gestational week is needed to be corrected accordingly.This time the B -ultrasound can pass through the abdomen or vagina, and the vaginal B ultrasound can be seen more clearly.

2nd time: 11 weeks of pregnancy -13 weeks+6 days (NT)

NT refers to the transparent belt of the fetal neck, and the specific stage of the fetal growth and development will appear. The abnormal thickening needs to consider whether there is abnormal fetal chromosome abnormalities.

Therefore, this is also a examination of deformity. The time for NT is 11 weeks of pregnancy-13 weeks+6 days.

3rd time: 15-20 weeks of pregnancy (Tang’s screening)

Everyone should be familiar with the famous Tang family screening. By detecting the nail protein (AFP), chorionic gonadotropin (HCG), free estradiol (E3) by detecting the blood of pregnant women, combined with the size of the fetus and the pregnancy week,The age, weight, and menstrual cycle of pregnant women calculate the possible risk values of certain diseases (such as 21-triple body, 18-trilateral, and neural tube defects).

Because the fetal pregnancy week is also a reference element, many community hospitals will do the B -ultrasound on the day of the intermediate Tang family screening, and once again confirm the size of the fetus and the gestational week.

4th time: around 24 weeks of pregnancy (large row of deformed)

In the second trimester, the structure of the fetus has basically been formed, and at this time, the fetal activity space is relatively large. In popular terms, it is clear at this time, and there is no one to block itself.At this time, a systematic screening is needed, the purpose is to discover serious structural malformations.

Most hospitals have upgraded this project to three -dimensional/four -dimensional, but we must remember not to blindly pursue the tall inspection.

The experienced doctors with regular hospitals, even if they only do two -dimensional, are more useful than the so -called four -dimensional and five -dimensional use in some unconventional small clinics.Most hospitals are arranged for 24 weeks, there are slight differences in various places.

5th time: 30-32 weeks of pregnancy (fetal growth measurement)

Fetal growth measurement is generally arranged around 30-32 weeks of pregnancy. At this time, the main purpose of doing B-ultrasound is to measure the growth and development of the fetus.Of course, when the B -ultrasound is visible, the structure of the fetus will still be seen as much as possible.

However, at this time, as the fetus gradually increased and the limbs, etc. were obstructed more and more, not all the structures could be seen. If you see the report, "due to fetal position, XX, XX and other structures are not clear."Don’t worry too much, because the previous (large row) requirements have been seen.

Sixth time: 37 weeks of pregnancy (evaluation before childbirth)

After 37 weeks, the fetus is already full. At this time, you need to do a B -ultrasound, because you need to evaluate the fetal position and the size of the fetus, can you be born by himself, wait for the baby to start naturally, or you need to end the cesarean cesarean production.

Of course, what I mentioned earlier is the rough number and purpose of the B -super that need to be done during the relatively normal and smooth pregnancy.However, if there are special circumstances, doctors may increase the content and number of B -ultrasound at any time.

It is very important for individualization. For example, there is a trend of premature birth in the second trimester, and you can do a B -ultrasound to evaluate the situation of the cervical canal; when the fetal movement is not good during the third trimester, you may open a B -ultrasound for pregnant women to do biophysical scores and so on.EssenceIn short, doing regular medical examinations after pregnancy is important to yourself and your baby.

Speaking of which, pregnant mothers may worry that if the B -ultrasound is too much, will it affect the fetus?

In fact, the ultrasonic examination itself does not have radiation, and there is no case that the ultrasound test of the diagnostic dose causes the fetus due to this diagnostic dose.Of course, the hospital will also reduce some unnecessary ultrasound examinations, which minimize the possible hazards.

In a word, mothers don’t have to worry too much about regular pregnancy examinations during regular hospitals.

Baby Scale-(24inch)