The charging standards of each hospital are different. You can consult the charge standard of the hospital you want to check. Large abnormal examination is optional, but it is recommended that pregnant women do four-dimensional color Doppler ultrasound examination to rule out intrauterine growth abnormalities. It is more accurate to go to the hospital for four-dimensional color Doppler ultrasound examination about 22 to 28 weeks of pregnancy. Doing it too early or too late will be inaccurate and will affect the result.