Do ultrasound need to hold urine, but the degree of holding urine is not to hold to hold it, that is, to check different organs need to hold urine degree is not the same: 1, if you want to check the gynecological uterus and uterine organs, the degree of holding urine to hold to the very strong desire to urinate, but can not hold it, gently press the abdomen can not have a strong sense of discomfort. 2, if you want to check the prostate, then the Can not hold too much urine, feel the urge to urinate can, on the contrary, when checking the prostate, if you hold urine hold too much, ultrasound will not see the prostate. 3, there is another is to check the bladder, this time to hold urine is also to hold until there is a strong desire to urinate, in the bladder is very full of the case, the bladder stones and other abnormal objects can be clearly seen, so the degree of holding urine according to the different parts of the examination, the degree of holding urine is also different. is not the same.