22 weeks to do four-dimensional research

During the second trimester of pregnancy, there is an important B-ultrasound screening between 20 and 24 weeks, mainly to screen for structural abnormalities of the whole body organs. Some hospitals do B-ultrasound during this period, and do ultrasound examination and four-dimensional color ultrasound examination repeatedly together. Some hospitals only do screening B-ultrasound without four-dimensional color ultrasound examination. But pregnant women are mainly concerned about whether the fetus is normal, this period of B-ultrasound examination is mainly to screen fetal organ structure serious abnormalities, such as heart, brain, kidney, placenta, etc., is to do systemic organ structure screening.