Table 1.

Impact of Age on Total Testosterone by HPLC–MS/MS in Normal Men

Age (years)20-2930-3940-4950-5960-6970-79>80
Mean (ng/dl)590546573534559417404
SD232206209194226177234
95th percentile1052910901909928755716
5th percentile28331931029629016892
N61765551194419

Results from Quest Diagnostics, San Juan Capistrano, CA, courtesy of M.P. Caulfield. To convert total testosterone levels to nmol/L multiply by 0.0347

From: Laboratory Assessment of Testicular Function

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