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editorial
. 2020 Mar;8(5):163. doi: 10.21037/atm.2019.11.48

Figure 1.

Figure 1

Schemes of testosterone replacement therapy (TRT) according to testosterone annual decrease velocity. TRT is currently administered when total testosterone (TT) serum levels are lower than 9.2 nmol/L. However, values in the lowest quartile of the normal range (9.2–16 nmol/L) may require TRT in symptomatic patients having higher than the expected testosterone annual decrease velocity. Red: serum TT range requiring TRT; Yellow: serum TT range which may require TRT in symptomatic patients having higher than the expected testosterone annual decrease velocity; Green: serum TT range not requiring TRT.