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.