AAS use can skew the kidney values enough to make the docs freak out and think that the person has stage 4 CKD or something. Had that one happen to me and had to get lots of specialized tests to refute that, and I never disclosed my gear use.I just did a little Google searching and I found that at stage 5 you need to be on dialysis and will need a kidney transplant.
Best thing to do is never get a physical done while on cycle.