Pin 10iu IM, get a GH serum test 4 hours later. I think it's $50
The only way to test it without pinning it is through a lab that has the equipment to do it, and you probably won't find one that would risk it. If you do find one, it's $$$$$ for the testing/risk.
Hgh is normally faked with igf or hcg so if you pin one of those and the hgh turns out to be fake, it's not a huge deal but unfortunately you're going to have to pin that shit to find out. Good luck.
Btw, id seriously consider hyges over kigs