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1 Other ultrasound exams, such as of the pelvis, may require a full bladder, so your doctor might ask you to drink up to six glasses of water two hours before the exam and not urinate until the exam is completed.
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.