When is the best time to have a 4D ultrasound during pregnancy?
Mar 28, 2023
Source: Cainiu Health
Dr. Lv Aiming
Introduction
The optimal time for a 4D ultrasound is between 18 and 24 weeks of pregnancy. By this stage, most of the fetus's organs have formed, the body surface is well-developed, and the amniotic fluid volume is moderate, allowing the fetus greater range of movement within the uterus. Performing a 4D ultrasound at this time facilitates observation of fetal activity in utero and enables clear visualization of fetal size, femur length, biparietal diameter, as well as detection of any abnormalities such as cleft lip and palate or skeletal dysplasia.
Generally, due to individual differences, there is no universally optimal gestational week for undergoing four-dimensional (4D) ultrasound. However, it is usually recommended to perform 4D ultrasound between 18 and 24 weeks of pregnancy, as this period allows for better assessment of fetal developmental abnormalities. The detailed explanation is as follows:
By 18–24 weeks of gestation, most fetal organs have formed, the body surface is relatively well-developed, amniotic fluid volume is adequate, and fetal movements within the uterus are more pronounced. Performing 4D ultrasound at this stage facilitates observation of fetal activity in utero and enables clear visualization of fetal size, femur length, biparietal diameter, and potential structural abnormalities such as cleft lip/palate or skeletal dysplasia.
Four-dimensional ultrasound has significant clinical value, allowing diagnosis of most structural malformations in the fetus and helping reduce birth defects. It is advisable to schedule an appointment for 4D ultrasound with a local healthcare provider in advance.
