How many weeks is the most suitable for three-dimensional

The best time to use three-dimensional color ultrasound to exclude fetal abnormalities is between 23 and 26 weeks of pregnancy. During this period, the amniotic fluid flow is relatively moderate, the fetus is relatively small, and it is easier to move in the uterine cavity, which is more suitable for observing fetal skin and organ deformities. You can also use 3D color ultrasound to do minor malformation screening at 29 to 33 weeks of pregnancy. At this time, the baby's development is gradually becoming more complete and relatively stable, and malformations of some organs can be clearly seen. However, 3D color ultrasound cannot detect 100% of all malformations.

In clinical medicine, three-dimensional color ultrasound is mainly used to eliminate fetal soft tissue deformities, limb deformities, and internal organ deformities. In short, it is an examination to exclude fetal deformities. Therefore, it is recommended that it is best to do it between 23 and 28 weeks of pregnancy. However, you need to make an appointment in advance. It is best to make an order, pay the money, and then make the appointment during the B-ultrasound period, and then go to the hospital for the corresponding examination according to the scheduled time. The time taken for three-dimensional color ultrasound is relatively long, because everything from the fetus's head to the toes and internal organs needs to be clearly understood, so it will take a relatively long time. It is recommended to eat before doing 3D scanning to avoid hypoglycemia caused by a long time. It is very important to have regular prenatal checkups when you are pregnant.

Three-dimensional color ultrasound examination is usually carried out between 30 and 34 weeks of pregnancy, mainly for comparative observation of the main anatomical structures of the fetus, dynamic observation of fetal attachments (such as embryo, fetal umbilical cord, amniotic fluid, etc.) and screening of late-onset malformations (such as body shortening, hydrocephalus, etc.). Three-dimensional ultrasound technology has greater advantages in observing the fetal appearance and internal organ structure, which helps to improve the success rate of diagnosing fetal skin and internal organ malformations. It can also accurately display the surface structure of information blocks and precisely measure the volume of irregular blocks.

Three-dimensional ultrasound is mainly used to rule out and screen fetal system malformations and do a good job in eugenics. Three-dimensional ultrasound has different purposes and checks different weeks of pregnancy. From 11 to 13 weeks plus 6 days, the main purpose is to check the thickness of the fetal nuchal translucency (NT) and conduct an early screening for abnormalities. The thicker the NT, the higher the risk of chromosomal abnormalities and cardiovascular abnormalities in the fetus. If you miss the time for NT testing, you can do NF (neck skin fold thickness) testing after 14 weeks, which has the same significance as NT.

The period from 21 to 23 weeks is the time for fetal abnormality screening, which is generally referred to as systemic color Doppler ultrasound examination. The six major malformations and some complex and significant malformations are eliminated by examining the fetal nervous system, urogenital system, skeletal system, etc. A three-dimensional fetal heart system screening is performed between 26 and 28 weeks to rule out complex malformations and significant abnormalities in the baby's heart, but atrial septal defect and ventricular septal defect cannot be completely ruled out. Therefore, in summary, the fetus generally undergoes at least three three-dimensional ultrasounds during pregnancy.