Pregnant women a few months four-dimensional ultrasound

The best time for 4D ultrasound examination is 20 - 24 weeks of pregnancy, because this period of fetal organ development is relatively perfect, and has physiological function, amniotic fluid is relatively more, is the most important period of fetal malformation screening. If the examination time is too early, it may cause missed diagnosis or incomplete observation. If the examination time is too late, due to fetal activity decline, intrauterine volume is occupied by the fetus, it may show partial tissue and bone observation incomplete. However, there are some pregnant women in the 30 - 32 weeks of pregnancy, but also for four-dimensional color Doppler ultrasound examination, this time the four-dimensional color Doppler ultrasound examination is mainly re-examination, to see fetal development.