A prostate ultrasound usually requires holding your urine. This is because when there is urine in the bladder it gives the prostate a better ability to differentiate from the surrounding organs. Fluid echoes very clearly in the ultrasound, if there is urine in the bladder can be more clearly distinguish prostate disease, such as the relationship between the prostate and the bladder, the prostate itself has no stones, no cysts or no hypoechoic occupations as well as hypoechoic occupations and other conditions. Therefore, it is best to hold your urine before the examination to make the examination clearer and provide a basis for the doctor’s judgment.