Investig Clin Urol.  2018 May;59(3):194-199. 10.4111/icu.2018.59.3.194.

Can recording only the day-time voided volumes predict bladder capacity?

  • 1Department of Urology, Dong-A University College of Medicine, Busan, Korea.
  • 2Department of Urology, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
  • 3Department of Urology, Chonnam National University Medical School, Gwangju, Korea.
  • 4Department of Urology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
  • 5Department of Urology, Pusan National University Yangsan Hospital, Yangsan, Korea.
  • 6Department of Urology, Chung-Ang University College of Medicine, Seoul, Korea.
  • 7Department of Urology, Korea University College of Medicine, Seoul, Korea.
  • 8Department of Urology, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
  • 9Department of Urology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.


This study aimed to demonstrate a method to easily assess bladder capacity using knowledge of day-time voided volumes, which can be obtained even from patients with nocturnal enuresis where the first morning void cannot accurately predict the bladder capacity due to bladder emptying overnight.
We evaluated 177 healthy children from 7 Korean medical centres entered the study between January 2008 and January 2009. Voided volumes measured for more than 48 hours were recorded in the frequency volume chart (FVC).
Most voided volumes during day-time were showed between 30% and 80% of the maximal voided volume (MVV). The maximal voided volume during day-time (MVVDT) was significantly less than the MVV (179.5±71.1 mL vs. 227.0±79.2 mL, p < 0.001). The correlation coefficients with the MVV were 0.801 for the estimated MVV using the MVVDT (MVVDT×1.25), which suggested a fairly strong relationship between the MVVDT×1.25 and the MVV.
The MVV derived from the FVC excluding the FMV was less than if the FMV had been included. When an accurate first morning voided volume cannot be obtained, as in patients with nocturnal enuresis, calculating MVVDT×1.25 allows estimation of the bladder capacity in place of the MVV.


Child; Diagnosis; Nocturnal enuresis; Urinary bladder
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