WebMD Answers
A renal ultrasound is a video taken of the kidneys using ultrasonic waves. A probe placed against the skin reflects high-energy sound waves off the kidneys, and a computer converts the information into images on a screen.
Renal ultrasounds are usually performed to try to find the cause of kidney damage or kidney failure. A renal ultrasound may be also done to look for cysts, stones, masses, or other abnormalities of the kidneys, even when the kidneys are functioning normally. Renal ultrasound is a painless and typically risk-free test.
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