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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.
You should wear a loose fitting two-piece outfit to your ultrasound exam. You will be asked to wear a gown during the procedure. This helps to prevent soiling your clothing with the ultrasound gel. Gallbladder ultrasounds require you to cease eating or drinking 8 hours prior to the exam.