I exercise 6 days per week including weight training and cardio. i'm on a high protein diet and my blood work just came back with creatinine levels of 1.2. should this be of concern?

Most likely not: Serum creatinine depends on several factors and one of them is muscle mass, doing regular excersice 6/week may establish the value slightly higher than it would be without training. Having said that in young person i would make sure that there is no urine abnormalities, that would suggest other potential problems. If normal and there is no new complains, i would probably monitor yearly.

Normal range: The national institute of health defines normal creatinine between 0.7-1.3 mg/dl for men and 0.6-1.1mg/dl for women. Your result is within normal range. If you are taking creatine supplement that sometime can cause an elevation of creatinine levels..

No: Many pathologists and nephrologists have little use for the current fad of using a spot creatinine to estimate glomerular filtration rate, getting all excited about tiny elevations. Creatinine reflects your muscularity. When i'm lifting, my creatinine's been as high as 1.5, no cause for concern. I doubt creatine raises creatinine & protein just raises bun. I think you are fine.

Creatinine 1.2: You should have no worries with your serum creatinine of 1.2 at your age. Due to your exercise routine, you should have a large amount of muscle mass, so any concerns you may have about your creatinine level are unfounded.