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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.
A patient should allow 1 1/2 to 2 hours for the entire test, including the preparation, echo imaging and stress test. How safe is a Stress Echo test? There are no known adverse effects from the ultrasound used during Echo imaging.