What is residual urine when we examine ultrasound of a prostate?

What is residual urine when we examine ultrasound of a prostate?

In this video, Dr. K K Aggarwal, President Heart Care Foundation of India and Group Editor in Chief MEDtalks, will talk about the residual urine during ultrasound of a prostate. Whenever a patient show prostatic symptoms, then residual urine is checked before and after full voiding. If the urine retained is less than 25% of the pre-void volume, dont get concerned. Only more than 25% volume of residual urine needs treatment.