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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.
For a transvaginal ultrasound, you should empty your bladder right before the procedure. Your doctor will explain the procedure to you and offer you the opportunity to ask any questions that you might have about the procedure. Based on your medical condition, your doctor may request other specific preparation.