These markers are higher than you should expect as a result of a high protein diet in a healthy athlete (
http://www.ncbi.nlm.nih.gov/pubmed/10722779 ) the use of creatine while also generally well tolerated in healthy individuals at normal doses ( about 10g per day ) at elevated doses the chance of causing changes in lab values increases exponentially. In addition many medications are Nephrotoxic (toxic to the kidneys) and when taken in combination the synergistic affect of the two together will cause bad labwork, so check any meds you may be taking for nephrotoxicity (
http://www.nlm.nih.gov/medlineplus/d...73.html#Dosage) .
Finally as with any addition of substances which place an additional strain on the filtering organs proper hydration is always the first and foremost thing that needs to be addressed and this has been strangely missing from the discussion.