Testosterone Deficiency in Men: Whom to Evaluate, What to Measure, and How to Treat

摘要

Low testosterone levels in men arenot uncommon. There is an age-relateddecline in testosterone levels, falling byabout 1% each year.1 Approximately 1%of healthy young men have total serumtestosterone levels below 250 ng/dl andapproximately 20% of healthy men over60 years old have serum testosterone levelsbelow 250 ng/dl.1 However, despite thefrequency of testosterone deficiency(TD), especially in aging men, significantquestions remain over whom to evaluate,what to measure and how to treat.