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Analysis of the Interobserver Variability in Penile Length Assessment
Mohamad Habous1, Gordon Muir2, Alaa Tealab3
1Urology and Andrology Department, Elaj Medical Centers, Jeddah, KSA.
The Journal of Sexual Medicine
|October 7, 2015
Summary
Flaccid penis measurements significantly underestimate erect size, by over 20% on average. This study highlights the need for erect measurements to accurately counsel men concerned about penis size.
Area of Science:
- Urology
- Mens Health
- Medical Measurement
Background:
- Men seeking penile augmentation need accurate information on normal penis size.
- Previous studies show variability in correlating stretched flaccid and erect penile length.
Purpose of the Study:
- To evaluate the precision of various penile measurements using multiple observers.
- To compare flaccid measurements against erect measurements.
Main Methods:
- 201 adult men received intracavernosal injections for full erection.
- Seven andrology specialists measured stretched flaccid and erect penile length and circumference.
- Measurements were taken in a controlled environment (21°C).
Main Results:
- Flaccid length measurements underestimated erect length by a mean of 2.64 cm (21.4%).
- Flaccid girth measurements underestimated erect girth by a mean of 2.27 cm (19.5%).
- Interobserver variability showed length underestimation from 16-27% and girth from 15-27%.
Conclusions:
- Flaccid penile measurements consistently underestimate erect size.
- Significant interobserver variability exists in penile measurements.
- Erect penis measurements are recommended for counseling men with small penis anxiety.
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