4D ultrasound and ultrasound are two different concepts of pregnancy checkups and there is no such thing as which one is more accurate.
4D ultrasound is a way to check the development of the fetus during pregnancy. Compared with 3D ultrasound and 2D ultrasound, its examination is clearer, and it can also observe the dynamic situation of the fetus in the uterine cavity.
While, the major screening is a program that pregnant women need to be examined during pregnancy, usually in 20~24 weeks of pregnancy, it can be examined through 2D, 3D or 4D ultrasound to rule out the existence of developmental abnormalities in the fetus, such as: the integrity of the spine, limbs, the heart, kidneys, gastrointestinal tract and other organs and tissues of the heart, kidney, gastrointestinal tract and other abnormalities, the skull and the face with or without defects, and so on.
Therefore, there is no comparison between the two, and it is impossible to compare them, and there is no such thing as which one is more accurate.
Pregnant women must strictly follow the requirements for pregnancy checkups to ensure the healthy development of their babies.