How many weeks of pregnancy is the best time to do four-dimensional color Doppler ultrasound at any time during pregnancy, but the best time is between 22 weeks and 26 weeks of pregnancy.
Because the brain development of the fetus is relatively perfect around 20 weeks to 28 weeks, 22 weeks to 26 weeks is the most suitable time, and the internal structures such as the limbs, facial features and heart of the fetus have been formed, the size of the fetus and the amniotic fluid are moderate, the activity space in the uterus is large, and the overall image of the fetus is relatively clear. At this time, it is the best time to do four dimensions. After all, the price of four-dimensional color Doppler ultrasound is high, and the gestational age is too small to see clearly.
Four-dimensional color Doppler ultrasound is mainly used to diagnose fetal congenital malformations, such as cleft lip, hydronephrosis, intestinal atresia, oligohydramnios or hyperhydramnios and so on. Four-dimensional color Doppler ultrasound is a good time to eliminate abnormalities. If there are no special circumstances, you must do it on time.
Four-dimensional color Doppler ultrasound usually takes 15-40 minutes to finish a four-dimensional color Doppler ultrasound in a few minutes, and it may take an hour to finish it in special circumstances. The following reasons will affect the time to do four dimensions:
First, the position of the fetus and the degree of cooperation are appropriate, so that the doctor can clearly see the head, face, chest and back, limbs, fingers (toes), heart and other parts. If the fetus has been lying down or facing the doctor, it will take a long time to see all the details in all directions. Some babies have been sleeping when doing four dimensions. The doctor will let pregnant women touch their stomachs, go out for a walk or eat something to guide the fetus to change their positions. The more cooperative babies will wake up immediately to adjust their postures and go through customs smoothly. Some babies are not very cooperative, and it takes time and effort to toss and turn several times before they are willing to move their positions.
Second, the thickness of the abdominal wall fat of pregnant women is too thick, which may affect the clarity of four-dimensional color Doppler ultrasound. It takes a long time for doctors to see it clearly, and some of them will be done next time. Of course, thin pregnant mothers don't have this problem.
Third, the machine causes the instruments and equipment are relatively advanced and have high definition, which can save a lot of time.
Fourth, the doctor's experience The doctor's experience will also affect the length of four-dimensional color ultrasound, and experienced doctors will operate faster.
What should we pay attention to when doing four-dimensional color Doppler ultrasound? Walking more before doing four-dimensional color Doppler ultrasound is beneficial to the fetus to change its position and keep the fetus active. It takes four dimensions for the baby to cooperate.
Have enough to eat and drink: half the chances of doing four-dimensional work on an hungry stomach need to be redone, because the hungry fetus will be unhappy, and if it is unhappy, it will not cooperate with the doctor, and may not move, or even cover its face with its hands. So pregnant women must eat and drink enough.