Post-void residual (PVR) measurement helps assess which aspect of urinary function?

• A. Bladder capacity
• B. Urine production overnight
• C. Residual urine after voiding
• D. Kidney function

Answer: (C)

PVR measurement tells you how much urine stays in the bladder after a person finishes urinating, so it assesses bladder emptying efficiency. It reflects whether the detrusor muscle is contracting well enough and whether there is any outlet obstruction or neurologic impairment affecting emptying. If the residual volume is low, the bladder is emptying effectively; if it’s high, there’s incomplete emptying, which can point to problems like an enlarged prostate, weak bladder muscle, or nerve issues. This is distinct from bladder capacity (how much the bladder can hold), nocturnal urine production, or kidney function, which involve different parts of urinary physiology. In practice, a bladder scan or catheterization is used to quantify the residual, with higher values prompting further evaluation and management to prevent complications such as infections or overflow incontinence.