Post Void Residual

One of the important measurements for urine left in the bladder after urination is the postvoid residual (PVR).  This test is performed to measure the amount of urine that is left in your bladder after you have made an attempt to empty it completely.
This study is done with an ultrasound.  You will be asked to lie flat on the exam table.  Gel is placed on the skin over your bladder.  The ultrasound probe will be placed over this area, and a recording will be made.  You will have no side effects as a result of this study, and your doctor will be able to go over the results with you immediately.  It usually takes just a minute or so.