What is it about?

Residual urine is defined as the volume of fluid remaining in the bladder immediately after completion of voiding. Accurate determination of intravesical residual urine is of significant importance and serves as an index of the adequacy of bladder emptying. The ability to confirm this measurement noninvasively in patients avoids discomfort, urethral trauma and urinary tract infection. Also, by avoiding the need for catheterization this technique permits more physiological assessment and allows for repeated examination without fear and anxiety for the patient.

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Why is it important?

Ultrasonographic determination of bladder volumes is simplez and noninvasive. Obesity, dense pubic hair,s abdominal distensions and irregular bladder shape produce poor quality images and have led to a search for an appropriate formula to calculate residual volume, such as those that use sagittal and transverse bladder diameter and bladder areas. We assessed prospectively the practical value of ultrasonography as a rapid means to determine accurately residual urine volume.


Ultrasonography cannot rapidly measure bladder volumes accurately to date. Catheterization remains the most accurate method of assessing post-void residuals but in many cases it may not be the best approach to patient care.

Dr Mohammad Reza Safarinejad
University of Medical Sceices

Read the Original

This page is a summary of: Accuracy of Residual Urine Measurement in Men: Comparison Between Real-Time Ultrasonography and Catheterization, The Journal of Urology, July 1997, Wolters Kluwer Health,
DOI: 10.1097/00005392-199707000-00016.
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