Hypogonadism Support Group
Hypogonadism is a medical term for a defect of the reproductive system that results in lack of function of the gonads. The gonads have two functions: to produce hormones, activin and to produce gametes. Deficiency of sex hormones can result in defective primary or secondary sexual development, or withdrawal effects (e.g., premature menopause) in adults. Defective egg or...
To arm yourself to ask the right questions, I might try reading a little about primary and secondary hypogonadism.
I would also google and read about the hypothalamicpituitarygonadal axis.
I guess if it were me and this was my son, it would not be enough to just start treating the low testosterone. I would keep pushing the doctors to try to answer why his is so low, and to be sure and rule out other hormone / gland problems.
What type of doctor are you using currently?
Good luck! And trust your instincts and your son.