Post-void residual refers to the amount of urine that remains in the bladder even after urinating, this is a common source of incontinence and bladder leakage. Post-void residual measurement is a non-invasive diagnostic test recommended for those suffering with bladder incontinence.

There are two main methods of measuring post-void residual:

• Straight catheter – After urinating, a physician will insert a small catheter into your urethra. Remaining urine in the bladder will be drained and measured by your physician.
• Ultrasound – After urinating, you will have an ultrasound examination. An ultrasound machine allows organs to be examined in a non-invasive manner. The ultrasound determines how much urine remains in the bladder.