Where do your testosterone levels actually sit?
Lab reports tell you whether you're inside the "normal range." Your personal report shows something different: where your number sits against healthy young men today, peak healthy young men, and men before the secular decline, what controlled studies measured at your level, and which labs to do next. Enter your numbers and we email it to you as a PDF.
Find these on your most recent lab report (look for Testosterone, Total and Testosterone, Free). Typical US results: Total T 200–1100 ng/dL, Free T 40–300 pg/mL.
Where should we send it?
We will email your personal testosterone report as a PDF: where you rank against peak healthy men, men today and men in 1989, what controlled studies measured at your level, and which labs to do next. A member of our team may follow up to answer questions about your results. Your information stays with Rewind.
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Without a number, the most useful thing you can do is measure. A morning fasting draw covering total testosterone, free testosterone (equilibrium dialysis preferred), and SHBG takes ten minutes and tells you exactly where you fit on the curve.
The "normal" range on a Quest or Labcorp report is calculated from the modern population — a population whose mean testosterone has fallen ~1% per year since the late 1980s. Many men in their 30s, 40s, and 50s carry numbers their lab labels "normal" that would have sat below the lower bound of healthy young men in 1990s reference data.
References. Travison TG et al., JCEM 2017;102(4):1161–1173 (modern harmonized percentiles, n=9,054, CDC LC-MS/MS) · Bhasin S et al., JCEM 2011;96(8):2430–2439 (FHS Gen 3 peak reference, n=456) · Travison TG et al., JCEM 2007;92(1):196–202 (MMAS secular decline) · Nguyen CP et al., PLOS ONE 2013 (Air Force veterans 1982–2002) · Vermeulen A, in Androgens and the Aging Male (Parthenon, 1996) · Bhasin S et al., Am J Physiol Endocrinol Metab 2001;281:E1172 / JCEM 2005;90:678 (dose-response) · Jasuja R et al., Andrology 2023;11(1):125–133 (free T equilibrium dialysis).
Disclaimer. This tool and the report it sends are for educational and orientation purposes only. It does not diagnose any condition or recommend treatment. Percentiles assume LC-MS/MS testosterone measurement and a fasting morning draw. Individual decisions should be made with a qualified clinician who can integrate symptoms, comorbidities, and trends — not a single value.