It is necessary to make an appointment before the 4D ultrasound. This is something that most mothers-to-be know. How do I make an appointment for a 4D ultrasound? The procedure of making an appointment is not exactly the same among different hospitals: 1. Pregnant women can go to the hospital where the 4D ultrasound examination is performed and make a face-to-face appointment directly, pay the fee and visit the hospital according to the appointment time; 2. The hospital can make an appointment by calling the hospital’s customer service. For 4D ultrasound examinations booked through the Internet or by telephone, when you go to the hospital, you need to explain the appointment, pay the fee in time, verify the information and then register and line up for the 4D ultrasound examination.