no known reason, if you want to know, do LH and FSH testing,
before you do anything.
You have a high SHBG
that increases demand for extra testosterone.
Even if you had good (natural testosterone) levels,
you would not have enough
Depending on your health insurance/financial status, mind set etc, you may go different routes.
I will givie you what I do for my self:
Blood test as on my post #44
Jan's BloodTest April13/2007
That is done at Quest Diagnostics blood drawn at Quest.
Also at Genova Diagnostics
Ask more questions as you need.