Patient's question:
The prenatal check-up was done at 17 weeks of pregnancy. In the genetic disease prenatal screening, uE3 was 0.58, which is lower than the normal value of 0.71. All other tests were normal. The three screening items—Trisomy 21, Trisomy 18, and open neural tube defects—were also low risk.Doctor's answer:
The best time to do a four-dimensional ultrasound is between 5 to 8 months of pregnancy (20-28 weeks), as this period is when the fetus's limbs and major organs have fully developed, and the amniotic fluid is most suitable for fetal anomaly screening. However, due to individual differences among pregnant women, please consult your doctor for the specific timing and follow the doctor's advice.