Depends: If it is acute- from dehydration, some medications, blockage or other causes involving kidneys it may be reversible. If is chronic kidney disease ( going on for some time- technically > 3 months), it may not be reversible, although there is a possibility. Careful assessment needs to be done to rule out correctable causes are found.
Answered 10/7/2013
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Big picture: Everybody's kidney function declines some with age. I'm good with your BUN especially if you eat a lot of protein. And if you're a mature athlete, this may even be fine; creatinine varies with a man's muscularity. When i was lifting weights daily in my early thirties, my creatinine run 1.5 to 1.6 -- perfectly healthy.
Answered 7/28/2018
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