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Related Experiment Video

Updated: Jun 28, 2025

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Ultrasonography of the Adult Male Urinary Tract for Urinary Functional Testing

Published on: August 14, 2019

Does ejaculation have an effect on urinary flow rates?

M Erkan Erbay¹, Fatih Tarhan²

¹Department of Urology, Okan University Hospital, Istanbul, Turkey.

Neurourology and Urodynamics

|April 10, 2024

Summary

Ejaculation temporarily increases maximum urinary flow rates (Qmax) in men with lower urinary tract symptoms, especially those with benign prostatic enlargement (BPE). This effect may impact uroflowmetry test results.

Keywords:

LUTS ejaculation urinary flow uroflowmetry

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Area of Science:

Urology
Men's Health
Lower Urinary Tract Symptoms

Background:

Lower urinary tract symptoms (LUTS) affect many men.
Uroflowmetry is a key diagnostic tool for LUTS.
The impact of ejaculation on uroflowmetry is not well understood.

Purpose of the Study:

To investigate the effect of ejaculation on urinary flow rates in men with LUTS.
To determine if ejaculation influences uroflowmetry measurements.

Main Methods:

55 male patients with LUTS underwent uroflowmetry (UF1) after 3 days of ejaculatory abstinence.
Participants then ejaculated, followed by repeat uroflowmetry at 2-4 hours (UF2) and 48-50 hours (UF3).
Measurements included Qmax and corrected Qmax (cQmax).

Main Results:

A statistically significant increase in mean Qmax and cQmax was observed between UF1 and UF2.
This effect was significant specifically in patients with benign prostatic enlargement (BPE).
The proportion of patients with Qmax <15 mL/s significantly differed between UF1 and UF2 in the BPE group.

Conclusions:

Ejaculation causes a temporary, significant increase in Qmax, particularly in men with BPE.
This finding suggests ejaculation can complicate uroflowmetry interpretation.
Further research is needed to fully understand this ejaculatory effect on urinary flow.