What is the best time for a 4D color ultrasound scan during pregnancy?

Generally speaking, there is no absolute optimal timing, but undergoing a 4D ultrasound scan between 22 and 28 weeks of pregnancy is considered ideal. The detailed analysis is as follows:

A 4D ultrasound is used to screen for most fetal structural abnormalities and to display real-time dynamic images of the unborn baby. During the 4D ultrasound examination, measurements are first taken of the fetal biparietal diameter, head circumference, abdominal circumference, femur length, and humerus length to estimate whether fetal development matches the gestational age. The examination then systematically evaluates the development of each fetal organ from head to toe, checking whether the brain structure is normal and whether the facial features are complete and continuous. Around 22 weeks of gestation, the fetal anatomical structures and movements become clearly visible, allowing detection of severe fetal abnormalities such as major open spinal defects or cartilage dysplasia. When performed around 28 weeks, the fetus has developed more subcutaneous fat and displays richer facial expressions. All body parts are more clearly defined than in earlier stages, enabling better observation of facial characteristics and movements. Therefore, conducting the scan between 22 and 28 weeks of pregnancy is recommended.

In summary, performing a 4D fetal ultrasound between 22 and 28 weeks allows for more intuitive and comprehensive evaluation. However, since fetal growth rates may vary among individuals, it is best to follow the specific recommendations of a qualified healthcare provider regarding the exact timing of the examination.