Background: Among the prognostic factors, preoperative serum testosterone levels is the subject of our study.

Methods: 39 patients between 40 to 75 years who was good candidate for RRP surgery in year 2012 in hasheminejad kidnety center enrolled the study. Preoperative total serum testosterone level of patients and Baseline sexual function was determined based on the IIEF questionnaire. Patients 1-3-6 months after surgery, "the Sexual function was evaluated with the IIEF questionnaire.Exclusion criteria included: use of LHRH-Agonist before or after taking medications that may cause ED. Adjuvant radiotherapy after surgery in patients who are candidates.

Results: 6 months after surgery, ED was better than 1 and 3 month after surgery but worsen than before surgery. The ED of one, three and six months after surgery in both groups was not significantly different between the two groups. ED compared between the two groups preoperatively Tstvtrvn less than 4, no significant differences were observed between the two groups. Also examined other variables, such as BMI, Gleason score was also significantly associated with the prevalence of ED.

Conclusion: By the result of this study, testosterone level before surgery is not a independent factor which affect the potency of patients after RRP surgery.