Patient's question:
When is the best time for Down syndrome screening, and what can be done if it's already overdue? I am 20 weeks and 3 days pregnant.Doctor's answer:
The best time to do a four-dimensional ultrasound is between the 5th and 8th months of pregnancy (20-28 weeks), because during this period the fetus's limbs and major organs have fully developed, and the amniotic fluid is more suitable for fetal anomaly screening. However, due to individual differences among pregnant women, please contact your doctor for your specific timing and follow the doctor's advice.