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Epi-Testosterone (male)

A healthy result should fall into the range 25 - 115 ng/mg.

Epi-Testosterone is one of several naturally-occurring testosterone compounds in the body that act as steroids. In the average male, four times as much testosterone is produced as Epi-Testosterone. 

The Epi-Testosterone test is usually ordered to see if an athlete (or police officer sometimes) has been taking non-prescription testosterone in any way, shape or form. Then the levels of Epi-Testosterone are compared to the levels of testosterone. The reasoning here is that if testosterone is being taken, then Epi-Testosterone levels will not show an appropriate increase.

Normal Ranges for Epitestosterone in ng/mL:

Men: 4 times as much testosterone as Epi-Testosterone, or less (Studies show ratios in athletes from 1/1 to 1.5/1 although there may be ethnic variation.)

Ratio >4 parts testosterone: 1 part Epi-Testosterone means there may be possible doping. (The original guidelines were a ratio of 6:1 in 1982.)

Critical Range: Epi-Testosterone urine levels >200 ng/mL is definitive and means there is some doping occurring.)

  1. https://www.labcorp.com/test-menu/37366/anabolic-steroids-screen-and-confirmation-plus-validity-urine
  2. http://www.rxmuscle.com/articles/chemical-enhancement/2325-understanding-the-testosterone-to-epitestosterone-ratio-drug-test.html
  3. https://www.ncbi.nlm.nih.gov/pubmed/1453132
  4. http://www.cyclingnews.com/features/testosterone-epitestosterone-and-the-doping-tests/
  5. https://www.sciencedirect.com/topics/neuroscience/epitestosterone 

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