Relationship between maximum voided volume obtained by bladder diary compared to contemporaneous uroflowmetry in men and women.

Journal Article (Journal Article)


The 24-hour bladder diary is considered to be the gold standard for evaluating maximum voided volume (MVV). However, we observed that patients often have a greater MVV during office uroflowmetry than that seen in the bladder diary. The purpose of this study is to compare these two non-invasive methods by which MVV can be determined - at the time of uroflowmetry (Q-MVV), or by 24hour bladder diary (BD-MVV).

Materials and methods

This was an Institutional Review Board approved retrospective study of patients evaluated for LUTS who completed a 24hour bladder diary and contemporaneous uroflowmetry. For Q-MVV, the patient was instructed to wait to void until their bladder felt full. Sample means were compared, and Pearson's correlations were calculated between the Q-MVV and BD-MVV data across the total sample, women, and men.


Seven hundred seventy one patients with LUTS completed bladder diaries. Of these, 400 patients, 205 women and 195 men, had contemporaneous Q-MVV. Mean BD-MVV was greater than mean Q-MVV. However, Q-MVV was larger in a sizable minority of patients. There was a weak correlation between BD-MVV and Q-MVV. Furthermore, there was a difference ≥50% between Q-MVV and BD-MVV in 165 patients (41%).


The data suggest that there is a difference between the two measurement tools, and that the BD-MVV was greater than Q-MVV. For a more reliable assessment of MVV, this study suggests that both Q-MVV and BD-MVV should be assessed and that the larger of the two values is a more reliable assessment of MVV.

Full Text

Duke Authors

Cited Authors

  • Rychik, K; Policastro, L; Weiss, J; Blaivas, J

Published Date

  • November 2021

Published In

Volume / Issue

  • 47 / 6

Start / End Page

  • 1189 - 1194

PubMed ID

  • 34156195

Pubmed Central ID

  • PMC8486436

Electronic International Standard Serial Number (EISSN)

  • 1677-6119

International Standard Serial Number (ISSN)

  • 1677-5538

Digital Object Identifier (DOI)

  • 10.1590/s1677-5538.ibju.2021.0211


  • eng