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Related Experiment Videos

Uroflow nomogram for male adolescents.

Dominik Pernkopf1, Eugen Plas, Thomas Lang

  • 1Department of Urology and Ludwig Boltzmann Institute for Urology and Andrology, Lainz Hospital Vienna, Austria. dominik.pernkopf@wienkav.at

The Journal of Urology
|September 8, 2005
PubMed
Summary

Uroflowmetry in adolescent males shows maximum urinary flow rate (Qmax) peaks between 350-550 cc voided volumes. Interpreting uroflow studies outside this range requires caution for accurate lower urinary tract symptom assessment.

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Area of Science:

  • Pediatric Urology
  • Urodynamics
  • Adolescent Health

Background:

  • Uroflowmetry is essential for evaluating lower urinary tract symptoms.
  • Existing nomograms for maximum urinary flow rate (Qmax) are based on limited sample sizes.
  • Normative data for adolescent males is scarce, hindering accurate interpretation of uroflow studies.

Purpose of the Study:

  • To establish percentile curves for Qmax in relation to voided volume in a large, homogenous group of healthy adolescent males.
  • To provide updated normative data for Qmax in male adolescents.
  • To compare generated curves with existing pediatric and adult nomograms.

Main Methods:

  • Investigated 348 healthy 18-year-old males with no urological history.
  • Included only samples with a voided volume of 150 cc or more.

Related Experiment Videos

  • Determined Qmax, average flow rate, time to Qmax, and volume from a single micturition per participant.

    • Main Results:

    • Average voided volume was 262 cc; average Qmax was 28.4 cc/sec.
    • Most participants (341/348) had a Qmax > 15 cc/sec.
    • Qmax increased with volume up to 350 cc, plateaued between 350-550 cc, and decreased at higher volumes.

    Conclusions:

    • Optimal Qmax in adolescent males occurs at voiding volumes between 350 and 550 cc.
    • Uroflow studies in this age group should be interpreted cautiously for volumes < 350 cc and > 550 cc.
    • This study provides crucial normative data for adolescent male uroflowmetry.