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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.
The ultrasound takes about 30 to 90 minutes to complete. Please plan to arrive about 15 minutes before your scheduled appointment to complete the registration process. 1  Please do not bring valuables such as jewelry and credit cards. You will be asked to change into a hospital gown and remove all jewelry. 2  Your ultrasound test is performed by specially trained technologists and interpreted by a vascular physician. 3  You will lie on a padded examining table during the test.