Do four-dimensional color Doppler ultrasound need to hold urine

Obstetrics do four-dimensional color ultrasound examination, generally in pregnancy between 20-28 weeks, this time do four-dimensional color ultrasound examination is not required to hold urine. Four-dimensional color Doppler ultrasound examination, the most widely used in clinical practice, is pregnancy fetal row abnormal examination, generally after 12 weeks of pregnancy, but premature four-dimensional color Doppler ultrasound examination, easy to cause some minor developmental abnormalities may miss diagnosis, so that the accuracy of the examination results decreased, after 20 weeks to do four-dimensional color Doppler ultrasound examination, because each system of the fetus has been developed perfect, the accuracy of the examination results will be significantly improved, generally will not show the phenomenon of missed diagnosis. In order to improve the accuracy of four-dimensional color Doppler examination results, when doing four-dimensional color Doppler examination, the fetus needs to fully cooperate, if the baby is not active or the position is not appropriate, pregnant women should follow the doctor's advice and take appropriate methods to induce fetal activity.