Hey brah, I'm 21. And I didn't actually do any blood tests before I started (stupidly). I had a blood test to confirm that my duta was legit (it was; I have very low DHT levels). I would just go to a GP and explain what you are doing. Ask to have your DHT, test, and estrogen levels checked. Maybe someone else can give you a better idea of what you should have baselined. I just sort of threw caution to the wind, something I don't advise.