Patient's question:
When is the time to do the Down syndrome screening and 4D color Doppler ultrasound for fetal anomaly examination, and where can it be done? When is the time to do the Down syndrome screening and 4D color Doppler ultrasound for fetal anomaly examination, and where can it be done? When is the time to do the Down syndrome screening and 4D color Doppler ultrasound for fetal anomaly examination, and where can it be done?Doctor's answer:
Medical Analysis: Hello, generally a Down syndrome screening is performed between weeks 13-17 to assess the risk of fetal chromosomal abnormalities. A detailed three-dimensional and four-dimensional ultrasound is conducted between weeks 22-26 to evaluate whether most of the fetal organs have any malformations. These two tests can only be performed in hospitals with high specifications, such as local tertiary hospitals.Advice: Regular prenatal check-ups should begin after the 20th week of pregnancy. Every four weeks of check-ups are required before the 36th week, and weekly check-ups should be conducted after the 36th week.