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There are no pathogens producing aromatase. What is the reason you are asking the question?
If the serum testosterone concentration is subnormal, supranormal serum LH and FSH concentrations (normal range for both about 1 to 8 mIU/mL in most laboratories) indicate primary hypogonadism, and values that are not supranormal indicate secondary hypogonadism. You said checks of the pituitary were negative. That means he has secondary hypogonadism.
How were the prolactin, cortisol at 8 AM, free thyroxine (T4), Fe, transferrin in the blood?