It is mainly to check whether the baby's development in the uterus conforms to the gestational age, whether the fetus is healthy, whether the limbs, brain and internal organs are deformed, and the amniotic fluid and umbilical cord. Pregnant women need to have a color Doppler ultrasound examination according to the time prescribed by the doctor.

Color Doppler ultrasound can exclude most fetal malformations, such as congenital heart disease, cleft lip and palate, edema fetus, polydactyly and external ear. However, due to different time and fetal position, the images generated are different, so all fetal malformations cannot be completely excluded.

Extended data:

Matters needing attention in large-row abnormal inspection:

The best time for screening in the proper gestational age is pregnancy 18 -24 weeks.

Four-dimensional color Doppler ultrasound should be done to check the abnormality, and it should be done in a qualified hospital.

It is necessary to check all pregnant women at 18-24 weeks of pregnancy.

There is a certain rate of missed diagnosis in the large-scale abnormality examination, and the detection rate reaches 50%-80%. The main reason for missed diagnosis is related to many factors such as gestational age, amniotic fluid, fetal position and maternal fat thickness, and many organs may not be displayed or displayed clearly. The detection rate of some fetal malformations by prenatal ultrasound is very low.

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