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Variability in normative urine flow rates.

W F Bower1, B Kwok, C K Yeung

  • 1Department of Surgery, The Chinese University of Hong Kong Prince of Wales Hospital, Shatin, Hong Kong, SAR China. wendybower@cuhk.edu.hk

The Journal of Urology
|May 1, 2004
PubMed
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Uroflowmetry parameters show minimal variability in healthy children. Staccato voiding occurs in about 30% of normal children, regardless of post-void residual urine levels.

Area of Science:

  • Pediatric Urology
  • Lower Urinary Tract Dysfunction
  • Urodynamics

Background:

  • Uroflowmetry is crucial for evaluating pediatric lower urinary tract dysfunction.
  • Current nomograms lack data on the intraindividual variability of uroflowmetry parameters.

Purpose of the Study:

  • To assess the intraindividual variability of uroflowmetry parameters in children without lower urinary tract symptoms.
  • To establish reliable uroflowmetry reference ranges for pediatric populations.

Main Methods:

  • 98 healthy children (4-16 years) underwent 4-6 uroflowmetry tests.
  • Post-void residual urine was measured via ultrasound to ensure complete bladder emptying.
  • Flow parameters were analyzed for variability and correlation with age, voided volume, and flow duration.

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Main Results:

  • Maximum and average flow rates exhibited low intraindividual variability (r >0.8 and r >0.74, respectively).
  • Flow rates correlated significantly with flow duration, voided volume, and patient age.
  • Staccato voiding patterns were observed in 30% of children, with no significant gender difference, though boys showed more intermittent voids.

Conclusions:

  • Uroflowmetry parameters demonstrate minimal variability in healthy children.
  • Staccato voiding is a common finding in approximately 30% of normal pediatric voiding cycles.
  • These findings support the reliability of uroflowmetry in assessing pediatric lower urinary tract function.