well if you stay on gear "most of the time" i can assure you that your blood work is going to be awful so i don't get the point of even bothering to run blood work.  just send me the $$$ instead of spending it on bloods and I can tell you the answer 
that would be like saying "i'm a diabetic but eat cake almost everyday, when should i run a glucose test" 
i promise you if you abuse steroids you are a walking time bomb.  didn't we learn from piana and mccarvers deaths?  if not you need to read their autopsies and see how their hearts were 2-3X normal size