How many weeks of pregnancy is it to check the mental color Doppler ultrasound?

Patient's question:

No

Doctor's answer:

Hello, it is best to have the Down syndrome screening between weeks 14-20 of pregnancy and the 4D ultrasound for fetal anomaly screening between weeks 22-26. If necessary, amniocentesis and cord blood analysis should be performed between weeks 16-20, and the fetal development should be monitored in a timely manner.