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Hi and thanks for the query.
Your creatinine is at the high of normal, that is because of the increased protein intake and the exercise. A single reading of 1.4 is not significant since there is an obvious cause of increase. However, it would be worthwhile to stop your routine for 4 to 5 days and then get the creatinine levels done again and this time along with BUN. I also suggest that you increase your water intake.
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Let me know if you have further questions.