Is 22 weeks too early to do four dimensions?

22 weeks of pregnancy to do four-dimensional ultrasound is more appropriate. Because the large screen abnormal ultrasound is generally between 20-24 weeks, this time the fetus has been fully developed normal, amniotic fluid is also more, the sound window is better, for the fetus to see more clearly, especially for the heart and other important organs development can be seen very clearly. If it is late, oligohydramnios is not easy to see clearly, so the general large screening deformity, small screening deformity from 20-24 weeks is the best time, so 22 weeks is a better time to do ultrasound. Early B ultrasound 12 weeks to check NT, especially to check whether the fetus has cardiac malformation, there is no 21-trisomy syndrome. The time for re-screening is 20-24 weeks, which is a large screening deformity. Ultrasound should be done from head to foot. The head, heart, liver, kidney and spleen can be clearly seen, especially in 20-24 weeks.