有症状的男性患者，如果至少两次清晨血清总睾酮水平低于 10.4 nmol/L（＜300 ng/dL），通常可得出性腺功能减退的诊断。
Assistant Professor of Surgery
Division of Urology
Albany Medical College
CW has worked as a consultant for Coloplast, and as an investigator for Auxilium Pharmaceuticals, Mereo BioPharma, PROCEPT BioRobotics, and Repros; and he is a paid reviewer at Oakstone Publishing and BMJ Best Practice. CW also has a family member who is an employee at Bristol-Myers Squibb.
Dr Charles Welliver would like to gratefully acknowledge Matthew Aoun for his help with updating this topic. He would also like to acknowledge Dr T. Hugh Jones, Dr Milena Braga-Basaria, and Dr Shehzad Basaria, previous contributors to this monograph. THJ and SB are authors of references cited in this topic. MB declared that she had no competing interests.
Department of Internal Medicine
University of Texas Medical Branch
RJU declares that he has no competing interests.
Oxford Centre for Diabetes, Endocrinology and Metabolism
NK declares that she has no competing interests.