What is the role of uroflow study in the workup of overactive bladder (OAB) in children?

Updated: Apr 01, 2019
  • Author: Pamela I Ellsworth, MD; Chief Editor: Edward David Kim, MD, FACS  more...
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Answer

A uroflow study is also helpful in the assessment of OAB symptoms and is performed by having the child void into a specialized collection device. The uroflow study can be described in terms of flow rate (mL/sec) and flow pattern. The flow pattern may be continuous, intermittent (interrupted), or staccato (flow does not completely stop but fluctuates because of incomplete relaxation of the sphincter).

Obtain several uroflow studies to achieve consistency. Ninety-nine percent of school children have a bell-shaped flow curve, whereas the remaining 1% have an abnormal flow curve. Such abnormal flow curves include flattened or intermittent flow curves.

For a urinary flow rate to be useful, the voided volume should be at least 50% of the child’s functional bladder capacity. Before the study is initiated, a bladder scan may be helpful in determining the bladder volume.


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