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International Journal of Endocrinology
Volume 2016, Article ID 1416503, 5 pages
Clinical Study

Changes in Testosterone Levels and Sex Hormone-Binding Globulin Levels in Extremely Obese Men after Bariatric Surgery

1Hormonal and Metabolic Disorders Research Unit, Excellence Center for Diabetes, Hormone, and Metabolism, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
2Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
3King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
4Department of Medicine, Faculty of Medicine, Naresuan University Hospital, Phitsanulok, Thailand
5Department of Surgery, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand

Received 17 May 2016; Revised 29 July 2016; Accepted 18 August 2016

Academic Editor: Mario Maggi

Copyright © 2016 Patchaya Boonchaya-anant et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. Obesity is a risk factor for hypogonadotropic hypogonadism in men. Weight loss has been shown to improve hypogonadism in obese men. This study evaluated the early changes in sex hormones profile after bariatric surgery. Methods. This is a prospective study including 29 morbidly obese men. Main outcomes were changes in serum levels of total testosterone (TT), free testosterone (cFT), SHBG, estradiol, adiponectin, and leptin at 1 and 6 months after surgery. Results. The mean age of patients was 31 ± 8 years and the mean BMI was 56.8 ± 11.7 kg/m2. Fifteen patients underwent Roux-en-Y gastric bypass and 14 patients underwent sleeve gastrectomy. At baseline, 22 patients (75.9%) had either low TT levels (<10.4 nmol/L) or low cFT levels (<225 pmol/L). Total testosterone and SHBG levels increased significantly at 1 month after surgery (). At 6 months after surgery, TT and cFT increased significantly () and 22 patients (75.9%) had normalized TT and cFT levels. There were no changes in estradiol levels at either 1 month or 6 months after surgery. Conclusions. Increases in TT and SHBG levels occurred early at 1 month after bariatric surgery while improvements in cFT levels were observed at 6 months after bariatric surgery.