Hi. I recently had a blood test done...my third in 3 years. Everything on the test was normal except my creatinine levels for the 2nd time in 3 blood tests. My first test I had creatinine of 1.35, then 2nd 1.30 (GFR of 77) and then last week 1.38 (GFR 70). My Bun was "9" the last time I had the test. Should I be worried about anything? I'm pretty healthy, I workout 3-4 days a week (weight lifting as well, but nothing hardcore). I am just worried my creatinine levels keep showing up higher than they should be, but everything else is normal. Or is this common? Thanks!!!