Accuracy of four-dimensional color Doppler ultrasound at 22 weeks

Under normal circumstances, four-dimensional color Doppler ultrasound in pregnancy 20~24 weeks to check, so 22 weeks to do four-dimensional color Doppler accuracy is relatively high, because this time the fetal activity space is relatively large. After four-dimensional color Doppler ultrasound can find whether there is anencephaly, fetal cartilage dysplasia, severe encephalocele, severe chest and abdominal wall defects, open spina bifida and other diseases. If the examination time is too early, some organ development is not complete will show unclear. If the examination time is too late, the fetus is relatively large, and some organs are obscured from each other. Therefore, it is recommended that the four-dimensional color Doppler examination is most appropriate at 20~24 weeks.