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Most ultrasound exams require no preparation, with a few exceptions: 1  For some ultrasound exams, such as of the gallbladder, your doctor may ask that you not eat or drink for up to 6 hours before the exam.
During the procedure: 1  You will be asked to wear a hospital gown. 2  You will lie on your back, with your right elbow out to the side and your right hand under your head. 3  An ultrasound may be used to mark the location of your liver. 4  You may receive a small dose of a sedative just prior to the procedure. 5  The doctor cleans and numbs an area on your 6  ... T