I will tell you, in fact, that the rest of his growth pattern is not entirely predictable.
He can still grow more than " a few centimeters" even now.
However, if you have doubts, an endocrinologist will tell you the same things I am.
Given his situation, studies have clearly indicated that whatever left he has to grow will not be positively or significantly affected by giving him growth hormone. Recommending this would not be evidence based, nor would it be a medical standard of care in the US.
As to testing.
All routine labs, which included liver function and kidney function.
TSH and T4
Sex hormone panel and SHBG.
Please click a positive rating on my specific post if you appreciate my correct, compreshensive and up to date answers.
That is how we are paid by just answer