I asked about dick size because of his age.
Read about Kallmann syndrome and Klinefelter syndrome. Though these conditions are rare a 4" penis warrants OP to read up on these 2 conditions. You may have incomplete puberty.
[USER=40391]@kevmtao[/USER] are you taking any supplements or medication please list?
Could'nt read the ferritin on the bottom of the report.
I would def go to an endocrinologist first even a pediatric one. Hopefully you get a knowledgeable one. You need to rule out underlying disease and hopefully find the cause of the low t. I would also suggest a pituitary MRI and a testicular ultrasound.
So your first lab your LH was normal now it's low?
You May certainly need trt but I think you need to be thorough in you finding cause. Maybe even growth hormone. You may end up going to other specialist in order to get trt.