I am thirteen years out from being a living kidney donor (Jan. 2004). Recently my doctor has been worried that my creatinine levels are too high (1.2 and 1.6). The doctor doesn't know whether this suggests a problem with my kidney, or if it is attributable to one kidney doing the work of two. I have never had any problems in the past, and in fact am in better health now than I was at the time of donation. I was told I had no other health problems that could be causing these increased levels. Anybody had an experience like this, and if so, what was recommended to treat it?