5 doctors weighed in:

What results in an elevated bun level with a normal serum creatinine?

5 doctors weighed in
Dr. Quresh Khairullah
Internal Medicine - Nephrology & Dialysis
2 doctors agree

In brief: See below

An elevated BUN with normal creatinine occurs most commonly in dehydrated individuals and is not a sign of kidney damage.
It may also occur in in certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids.

In brief: See below

An elevated BUN with normal creatinine occurs most commonly in dehydrated individuals and is not a sign of kidney damage.
It may also occur in in certain other conditions like bleeding in the intestines, artificial nutrition intravenously of Amino Acids and use of steroids.
Dr. Quresh Khairullah
Dr. Quresh Khairullah
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Dr. Ed Friedlander
Pathology
1 doctor agrees

In brief: Many causes

Urea is the breakdown product of protein, and even a high-protein diet -- even eating a steak -- will raise it.
Being dehydrated, as after a good workout, or (in those who are obviously sick) shock / GI bleeding / heart failure will raise BUN in preference to creatinine. And reference ranges are set so that several % of healthies fall outside. Labs mean nothing by themselves.

In brief: Many causes

Urea is the breakdown product of protein, and even a high-protein diet -- even eating a steak -- will raise it.
Being dehydrated, as after a good workout, or (in those who are obviously sick) shock / GI bleeding / heart failure will raise BUN in preference to creatinine. And reference ranges are set so that several % of healthies fall outside. Labs mean nothing by themselves.
Dr. Ed Friedlander
Dr. Ed Friedlander
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