Table 1 The 2.5th and 5th percentile values for harmonized circulating total testosterone concentrations among nonobese and obese men, ages 19 years to 39 years.
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To generate harmonized reference ranges, the assays used to measure testosterone concentrations in the participating cohort studies were cross-calibrated by measuring testosterone levels in serum samples from approximately 100 men in each cohort in the CDC Clinical Reference Laboratory.42 Normalizing equations were generated using Passing-Bablok regression and used to generate harmonized values, from which standardized, reference ranges were derived. The 2.5th and 5th percentile values of the harmonized values in healthy, nonobese men as well as in all men are shown in the table.
To convert total testosterone from nanograms per deciliter to nanomoles per liter (SI units), multiply the value of nanograms per deciliter by 0.0347
Data from Travison TG, Vesper HW, Orwoll E, Wu F, Kaufman JM, Wang Y, Lapauw B, Fiers T, Matsumoto AM, Bhasin S. Harmonized Reference Ranges for Circulating Testosterone Levels in Men of Four Cohort Studies in the United States and Europe. J Clin Endocrinol Metab. 2017;102(4):1161-73.
