Serum Testosterone Levels Are Negatively Correlated with International Prostate Symptom Score and Transitional Prostate Volume.

OBJECTIVES: To investigate the correlation of serum total testosterone levels with International Prostate Symptom Score and prostate volume in aging men.

METHODS: A cross-sectional study was conducted in 50 men who had participated in a medical examination. Prostate specific antigen levels, International Prostate Symptom Score, total/transitional prostate volume, body mass index, maximal flow rate, and serum total testosterone levels were evaluated. The correlation between serum total testosterone levels and additional parameters was statistically analyzed.

RESULTS: The median age and total testosterone levels were 60.4 years (interquartile range: 55.0-68.0 years) and 4.3 ng/mL (interquartile range: 3.6-5.1 ng/mL), respectively. Total testosterone levels showed a significant negative correlation with body mass index, transitional prostate volume, International Prostate Symptom Score (including voiding/storage sub scores). On multivariate linear regression models, the total testosterone level was associated with body mass index and total International Prostate Symptom Score.

CONCLUSIONS: As total testosterone levels decrease, both International Prostate Symptom Score and transitional prostate volume increase significantly. These findings provide evidence of the presence of more severe lower urinary tract symptoms and larger transitional prostate volume in aging men.