Prostate-specific antigen testing in hypogonadism: implications for the safety of testosterone-replacement therapy.

Hypogonadal men have lower prostate volumes and serum prostate-specific antigen (PSA) levels than age-matched controls. When present, prostate cancer in hypogonadal men is more aggressive than in eugonadal men, and given the lack of specificity of PSA for diagnosing prostate cancer, a more accurate test would be desirable in hypogonadal men. Once testosterone-replacement therapy is started in hypogonadal men, PSA levels should be measured regularly; however, there is often an initial rise 3-6 months after starting treatment. A rise of >0.5 ng/mL within this time requires further investigation.