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levels is between 0.5 to 1.5 mg/dl. Elevated creatinine levels are concerning and related to multiple clinical condition such as infection, diabetes, hydration and other renal disorder
. I presume the elevation was secondary to his recent lung infection
Any way, the current creatinine value are normal. So there is no problem in his kidney.
I suggest you to keep his / her blood sugars in limits to avoid any future complications including renal disease
I understand you are concerned and I hope this answer is reassuring.
All the Best