Normal Testosterone Range Defined
Researchers have established a reference range for normal total testosterone levels using values harmonized by the Steroid Hormone Standardization Program at the Centers for Disease Control and Prevention (CDC) in Atlanta.

For healthy, non-obese men ages 19 to 39 from Europe or the United States, the harmonized normal range of total testosterone is 264 to 916 ng/dL, a range that corresponds to the 2.5th to 97.5th percentile, investigators reported in a paper published online ahead of print the Journal of Clinical Endocrinology & Metabolism. Values below the 2.5th percentile indicate hypogonadism.

http://www.renalandurologynews.com/hypogonadism/hypogonadism-normal-total-testosterone-levels-defined-cdc/article/631137/
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