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A 40-year-old member asked:

What causes an elevated bun/creatinine ratio on your lab results?

1 doctor answer1 doctor weighed in
Dr. Leto Quarles
Family Medicine 24 years experience
Dehydration: Is most common cause of high BUN with normal creatinine (therefore high ratio). Other causes can be high protein load in the diet, muscle injury or muscle breakdown (bun is formed by the breakdown of proteins). Whether to worry depends on how high the BUN is, and the circumstances when the test was drawn. Talk to the doctor who ordered the test for personalized interpretation.

Similar questions

A 40-year-old member asked:

My lab results were normal for bun and creatinine however bun/creatinine ratio was high?

1 doctor answer1 doctor weighed in
Dr. Adrian Baudy IV
Internal Medicine 13 years experience
Possibly Dehydration: Thank goodness, your kidney function is normal. But any increase bun/creatinine ratio, typically > 20 could mean that you are dehydrated.
Last updated Oct 23, 2019


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