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I also had the same lab result & my doctor said it was not a concern but a sign of dehydration probably caused by the fast. I would think that since carbs make us hold so much more water weight, that low carbing would make you stay slightly dehydrated.
Dina, according to this article your creatinine levels are what doctors look at when considering kidney function and since yours are well within normal range, you probably don't have to be too concerned with the BUN being at the high end of normal.
If your creatinine levels started climbing along with the elevated BUN, then you would probably have cause for concern.
High BUN for low carbers is normal because of the high amount of protein in your diet.
BUN concentrations may be elevated when there is excessive protein catabolism (breakdown), significantly increased protein in the diet, or gastrointestinal bleeding (because of the proteins present in the blood).