The cost of an ultrasound examination of the kidney may vary depending on each region and hospital, and is usually between$100 and$150. Ultrasound examination of the kidneys can reflect the volume and size of the kidneys, as well as the presence of kidney stones and other problems. If both kidneys appear to be reduced in size, it may indicate the possibility of chronic kidney disease. If the kidney volume is reduced unilaterally, there may be renal artery stenosis or congenital dysplasia. If hydronephrosis is present, it may indicate urinary tract obstruction. If kidney stones are present, they may need to be drained. Kidney stones often appear as strong echogenic dots on renal ultrasound that can move.