Do I need to make an appointment for 4-D?

Under normal circumstances, four-dimensional color Doppler ultrasound needs to make an appointment. Pregnant women in six months can do four-dimensional color Doppler ultrasound, after four-dimensional color Doppler ultrasound more clear, all-round to see the fetal appearance and development, see whether the fetus has cleft lip and other malformations. Do four-dimensional color Doppler ultrasound before do not need to hold urine, also do not need fasting, about half an hour, do four-dimensional color Doppler ultrasound pregnant women had better choose to wear loose clothes, to prevent affecting the examination results.