Transgender men preserve their fertility potential even after one year of treatment with the male hormone testosterone, according to a study to be presented at ENDO 2019, the Endocrine Society’s annual meeting in New Orleans, La. Even with the expected increase in testosterone blood levels and decrease in estrogen at one year of therapy, anti-Mullerian hormone (AMH) levels remained in the normal range for fertility. AMH levels are used to assess the ovarian reserve.