Can I make an appointment for four weeks during pregnancy?

Pregnancy can be booked four-dimensional color ultrasound, four-dimensional color ultrasound general hospitals need to make an appointment. about the time according to your gestational week to calculate, for example, you may make an appointment in early pregnancy time to 1 to 2 months, in 20 weeks or so may make an appointment time is shorter, generally 1 to 2 weeks can make an appointment, but this situation as far as possible in advance of the appointment. 4-D color Doppler ultrasound checks the development of various fetal systems, including fetal intracranial development, fetal heart development, liver development, bilateral urinary bladder development, and fetal limb development. These all need to be accurately measured. Compared with normal, if abnormal conditions occur, we need to do further examinations to confirm the diagnosis.