Half of the large-scale abnormality examination is carried out between 20 and 24 weeks. For large hospitals, this examination is mostly carried out by ordinary B-ultrasound or three-dimensional color ultrasound. After all, the examination time is shorter and the results are faster, which is also beneficial for pregnant mothers who come to check so many times every day in large hospitals.

If you want to do four-dimensional color Doppler ultrasound, you can choose a specialized hospital, such as the Red House Maternity Hospital, which has the same four-dimensional color Doppler ultrasound equipment as its subsidiary, and the doctors are also retired people and retired old doctors of women and children.