It is not really correlated to creatine. People think creatinine and creatine are the same thing; hell I even use to before I became a nurse.
BUN/Creatinine levels can be falsely elevated for numerous reasons. If you are dehydrated, your BUN will go up..if you ate a large protein meal, the values may be altered, if you just worked out, or even within the last 24 hours or even longer, your creatinine may be higher. There are many variables that can alter that reading. Being a littler larger in size, muscle wise will slightly increase creatinine although your value is not slightly increased; it is a tad high.
I would not be overly concerned, and I am not aware of any specific supplement of steroid that directly effects these other than tren.
How if your blood pressure?