I'm on HRT. I suspect I've been low for many years. I don't remember what my exact levels are, but they are very low normal.
I've had an inability to lose body fat, zero aggression/borderline depression, sleep disorders, & diabetes, & my sex drive has wavered.
Doc started me on Andriol, then androgel, now I'm on Test Cyp, 675mg per month. I self administer weekly. Doc goes by symptoms, mainly, so, even though my levels have barely risen, my symptoms are mostly gone.
BTW, after 15 yrs of weight lifting, my physique is finally starting to show some improvements .