Authors : A. U. B. Pethiyagoda; V. D. P. Liyanage; S. Narampanawa; M. M. M. A. Mansoor; C. A. H. M. D. A. Chandrasekara

Volume/Issue : Volume 11 - 2026, Issue 6 - June

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Google Scholar : https://tinyurl.com/4w9dpjwz

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DOI : https://doi.org/10.38124/ijisrt/26jun179

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Abstract : Uroflowmetry and post-void residual volume (PVR) are key non-invasive tools in evaluating lower urinary tract symptoms (LUTS). While peak flow rate (Qmax) is commonly used, the role of average flow rate (Qavg) in predicting incomplete bladder emptying remains unclear. This study aims to compare the association between peak and average uroflowmetry flow rates and post-void residual volume. An analytical cross-sectional study was conducted among adults presenting with LUTS. Uroflowmetry parameters (Qmax, Qavg, voided volume) and PVR were recorded.

Keywords : Uroflowmetry, Peak Flow Rate (Qmax), Average Flow Rate (Qavg), Post-Void Residual Volume (PVR), Lower Urinary Tract Symptoms (LUTS).

References :

1. P. Abrams et al., “The standardisation of terminology in lower urinary tract function: report from the standardisation sub-committee of the International Continence Society,” Urology, vol. 61, no. 1, pp. 37–49, Jan. 2003, doi: https://doi.org/10.1016/s0090-4295(02)02243-4.
2. P. F. W. M. Rosier et al., “International Continence Society Good Urodynamic Practices and Terms 2016: Urodynamics, uroflowmetry, cystometry, and pressure-flow study,” Neurourology and Urodynamics, vol. 36, no. 5, pp. 1243–1260, Dec. 2016, doi: https://doi.org/10.1002/nau.23124.
3. M. Oelke et al., “EAU Guidelines on the Treatment and Follow-up of Non-neurogenic Male Lower Urinary Tract Symptoms Including Benign Prostatic Obstruction,” European Urology, vol. 64, no. 1, pp. 118–140, Jul. 2013, doi: https://doi.org/10.1016/j.eururo.2013.03.004.
4. D. J. Griffiths, “PRESSURE-FLOW STUDIES OF MICTURITION,” Urologic Clinics of North America, vol. 23, no. 2, pp. 279–297, May 1996, doi: https://doi.org/10.1016/s0094-0143(05)70311-6.
5. L. Y. Lim and S. S.-D. Yang, “Normal postvoid residual urine in healthy adults,” Neurourology and urodynamics, vol. 43, no. 1, pp. 81–87, Jan. 2024, doi: https://doi.org/10.1002/nau.25294.
6. K. M. C. Verhamme, J. P. Dieleman, G. S. Bleumink, J. van der Lei, and M. C. J. M. Sturkenboom, “Incidence and Prevalence of Lower Urinary Tract Symptoms Suggestive of Benign Prostatic Hyperplasia in Primary Care—The Triumph Project,” European Urology, vol. 42, no. 4, pp. 323–328, Oct. 2002, doi: https://doi.org/10.1016/S0302-2838(02)00354-8.
7. L. Y. Lim and S. S.-D. Yang, “Normal postvoid residual urine in healthy adults,” Neurourology and urodynamics, vol. 43, no. 1, pp. 81–87, Jan. 2024, doi: https://doi.org/10.1002/nau.25294.
8. D. P. Bartkowski and R. G. Doubrava, “Ability of a normal dysfunctional voiding symptom score to predict uroflowmetry and external urinary sphincter electromyography patterns in children,” Journal of Urology, vol. 172, no. 5, pp. 1980–1985, Nov. 2004, doi: https://doi.org/10.1097/01.ju.0000140849.49348.62.
9. Reynard et al., “The ICS-‘BPH’ Study: uroflowmetry, lower urinary tract symptoms and bladder outlet obstruction,” BJU International, vol. 82, no. 5, pp. 619–623, Nov. 1998, doi: https://doi.org/10.1046/j.1464-410x.1998.00813.x.
10. M. Belal and P. Abrams, “Noninvasive Methods of Diagnosing Bladder Outlet Obstruction in Men. Part 1: Nonurodynamic Approach,” vol. 176, no. 1, pp. 22–28, Jul. 2006, doi: https://doi.org/10.1016/s0022-5347(06)00569-6.
11. S. Chang, S. S. Yang, and I. Chiang, “Large voided volume suggestive of abnormal uroflow pattern and elevated post‐void residual urine,” Neurourology and Urodynamics, vol. 30, no. 1, pp. 58–61, Dec. 2010, doi: https://doi.org/10.1002/nau.20901.
12. G. W. Drach, T. N. Layton, and W. Binard, “Male Peak Urinary Flow Rate: Relationships to Volume Voided and Age,” The Journal of Urology, vol. 122, no. 2, pp. 210–214, Aug. 1979, doi: https://doi.org/10.1016/s0022-5347(17)56333-8.
13. Wolfgang Schäfer, “Analysis of bladder-outlet function with the linearized passive urethral resistance relation, linPURR, and a disease-specific approach for grading obstruction: from complex to simple,” vol. 13, no. 1, Feb. 1995, doi: https://doi.org/10.1007/bf00182666.
14. J. L. H. R. Bosch and J. P. Weiss, “The Prevalence and Causes of Nocturia,” Journal of Urology, vol. 184, no. 2, pp. 440–446, Aug. 2010, doi: https://doi.org/10.1016/j.juro.2010.04.011.
15. P. Abrams, “Urodynamics,” SpringerLink, 2021, doi: https://doi.org/10.1007-1-84628-129-6.