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3 - Flow rate testing
- By Marcus Drake, Bristol Urological Institute, Ahmed Shaban, Bristol Urological Institute
Edited by Ranee Thakar, Philip Toosz-Hobson, Lucia Dolan
Book:

Urodynamics Illustrated

Published online:

05 February 2014

Print publication:

01 October 2011, pp 21-34
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Summary

Flow rate testing is a simple, non-invasive test, which can provide useful clinical information. The two most common flow rate measurement systems are gravimetric and rotating disc. This chapter discusses preparation and procedures for performing the flow rate testing and clinical cases of the flow rate testing. The flow rate machine should be in a private area. The patient should be well hydrated and prepared to wait for as long as needed to obtain an adequate result. The patient is instructed to void normally in their normal voiding position. Post-void residual urine volume (PVR) is measured within 10 minutes of voiding. Low Qmax may be associated with voiding dysfunction after continence surgery or pelvic organ prolapse. A high PVR may occur infrequently after anticholinergic drug administration in overactive bladder syndrome. Low Qmax can also result from bladder outlet obstruction. Elevated PVR can occur in conjunction with detrusor failure.