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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 to prepare for your abdominal ultrasound. An abdominal ultrasound may be ordered to evaluate the aorta, pancreas, liver, bile ducts, gallbladder, kidneys, or spleen. The technologist will take multiple pictures of each organ. The exam takes about 30-45 minutes.