Testosterone-to-Epitestosterone Ratio
Also written as: T/E — Testosterone-to-Epitestosterone Ratio
A calculated ratio used primarily in anti-doping testing to detect testosterone supplementation.
Full Definition
The testosterone-to-epitestosterone ratio (T/E ratio) is a calculated parameter that compares endogenous testosterone to epitestosterone, an inactive stereoisomer of testosterone. Under normal physiological conditions, this ratio is typically 1:1 to 2:1. Ratios significantly above 4:1 may indicate exogenous testosterone administration, making this test valuable in sports medicine and anti-doping programs. The T/E ratio can be affected by genetic variants in testosterone metabolism, certain medical conditions, and some medications, requiring careful interpretation in clinical contexts.
Usage
Usage note: Primarily used in sports medicine; clinical utility is limited outside anti-doping contexts.
In Context
- "The elevated testosterone-to-epitestosterone ratio of 8:1 suggested exogenous testosterone use." — Sports medicine evaluation
- "T/E ratio interpretation requires consideration of individual baseline values and genetic factors." — Anti-doping laboratory report