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What It Is. A renal ultrasound is a safe and painless test that uses sound waves to make images of the kidneys, ureters, and bladder. The kidneys are a pair of bean-shaped organs located toward the back of the abdominal cavity, just above the waist. They remove waste products from the blood and produce urine.
Ultrasound uses sound waves to create images of internal organs. For this test, a small, microphone-like instrument called a transducer is placed on the skin near the kidney after a gel is applied. The transducer gives off sound waves and picks up the echoes as they bounce off the tissues in the kidney.