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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.
Things You'll Need. 1  32 oz. of water. 2  One hour before the exam, empty your bladder. 3  Fifty to 45 minutes before the exam, finish drinking the 32 ounces of water.  Arrive at the hospital or clinic 15 minutes 1  early. The first part of the ultrasound will be the transabdominal ultrasound.