A few months. Four dimensions.
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The main purpose of four-dimensional color Doppler ultrasound is to exclude fetal abnormalities, so it is important to choose the appropriate gestational week to do four-dimensional color Doppler ultrasound. It is generally recommended that four-dimensional color Doppler ultrasound be arranged at 18 weeks to 26 weeks of pregnancy, and the most ideal number of weeks is 22 weeks to 24 weeks of pregnancy. Because this time the fetus has been relatively large, each organ is easy to see clearly, and this time the fetal position is not fixed, the fetus in the uterus inside the range of activities is relatively large, conducive to B ultrasound doctors from different angles to observe the fetus. If the first four-dimensional ultrasound found that there are small problems, need to review. Do four-dimensional ultrasound time again is not too fixed, this depends on the specific doctor's advice.
