What should be checked at 20 weeks of pregnancy? Can you do four?

Patient's question:

No

Doctor's answer:

Analysis of the condition: Hello, it is recommended that you have a Down syndrome screening at weeks 15-20 of pregnancy to check the intellectual development of the fetus. Within weeks 22-26 of pregnancy, it is best to have a 4D color Doppler ultrasound for fetal anomaly screening to understand whether the fetus has major abnormalities and the development of major organs.