Re: worried about creatinine increase
Creatine levels lower eGFR in a non-linear manner. That is to say, that as creatinine levels increase in a blood serum sample, there is a drop in percentage of kidney function, however, this drop of eGFR might be more meaningful, say between 1.0 to 1.5, than between 1.5-2.0. The latter is what is meant by a non-linear drop in kidney function.
Although hydration and strenuous exercise prior to your blood draw can have a noticeable affect on your GFR reading (I measured .14 lower on my creatinine measure, from one month to the next, by following the hydrating advice as Cora has offered you). That said, however, you still want to keep track of the trends in your GFR over time. It is altogether possible that you have had a drop in kidney function, all things being equal. I am not sure what a .4 rise in your creatinine level might signal, but that can be as much as a 10 point drop in GFR. I went from a GFR of 93, in July of 2010, prior to a surgical procedure, down to as low as 71, then, back up again, to 79-82, where it has stayed more or less stable for the last couple of years.
The kidneys are the kind of organ that can do a lot of filtering with little healthy tissue, and one might not feel any noticeable symptoms until well over half of kidney function is gone. I am crossing my fingers that my kidney ailment is greatly slowed or stopped, and all indications, like BP, urinalyses, and electrolyte counts, tell me that I am stable. You can do the same to preserve kidney function with a few modifications. Good Luck!
Last edited by Deanne1962; 11-13-2012 at 02:40 AM.