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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.
How to Prepare for an Ultrasound. The steps you will take to prepare for an ultrasound will depend on the area or organ that is being examined. Your doctor may tell you to fast for eight to 12 hours before your ultrasound, especially if your abdomen is being examined.