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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.
How is the patient prepared for a pelvic ultrasound? Drink several glasses of water and do not urinate for about one hour before the exam. A lubricating gel may be applied to the area so moving the transducer is easier.