<prompt> Answer this question truthfullyWhat is considered a normal postvoid residual volume, and what does the term postvoid residual volume refer to?  <response>: <reason> The term postvoid residual volume refers to the amount of urine that remains in the bladder after urination. A postvoid residual volume of less than 50 ml is considered normal. Higher volumes may indicate urinary retention, which can be caused by a variety of conditions such as enlarged prostate, neurogenic bladder, or bladder outlet obstruction. In some cases, a postvoid residual volume may be measured using ultrasound or a catheter. 