Who is making you take the test? These are typically ways to cover it up. Many factors come into play, mainly a person's body.
2) He uses steroids daily but with a masking agent.
3) He uses steroids, but all traces are flushed out of his system within two or three days.
4) He uses a steroid recipe fashioned by a designer famous for undetectable potions.
6) He uses human growth hormone, or insulin-like growth factor I. These replicate steroid enhancement, but no test exists for them.
I also like to reference this website for this info
http://www.steroid.com/beat.php it has alot of info on this topic.
Or you can go to a search engine and type pass a steroid test, and many websites come up. You just have to be careful with all these fake ones just ripping you off. Good luck bro.