Hi, I'm a 32 year old male in good physical condition. I recently had my 4th blood test done for a high serum creatinine. It came back the same as the last 3...at a level of 1.33. I am a very active person, playing sports 3 or more times a week, manual labor 5 to 6 days a week, and love to eat meat. Do I need to be concerned with this result? My BUN is 14 and BUN/Creatinine Ratio is 11. At 6' 195lbs, I don't feel as there is a problem.