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This is Dr. David
I see you are worried about your BUN/Creatinine ratio
what is the BUN and creatinine levels themselves?
if you drank alot of water and you have a very low creatinine level, this can cause the ratio to go up above 20.
that is not dangerous if you don't have a history of kidney problems.
if your BUN and creatinine levels are both normal, then I would not worry.