The guidelines from Endocrine society, the most commonly used guidelines along with WPATH state this:
> Clinicians should measure serum estradiol and serum testosterone and maintain them at the level for premenopausal females (100 to 200 pg/mL and **<50 ng/dL**, respectively).
https://academic.oup.com/jcem/article/102/11/3869/4157558?login=false
> Clinicians should measure serum estradiol and serum testosterone and maintain them at the level for premenopausal females (100 to 200 pg/mL and **<50 ng/dL**, respectively).
https://academic.oup.com/jcem/article/102/11/3869/4157558?login=false