A 3.5-5 MHz probe is typically used to scan the kidney. For the right kidney, have the patient lie supine and place the probe in the right lower intercostal space in the midaxillary line. Use the liver as your “acoustic window” and aim the probe slightly posteriorly (toward the kidney). Gently rock the probe (up and down or side to side) to scan the entire kidney. If needed, you can have the patient inspire or exhale, which allows for subtle movement of the kidney. Obtain longitudinal (long axis) and transverse (short axis) views (Figure 1-3 and video clip1 and 2).