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Pediatrics/elevated BUN/Creatinine Ratio

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Question
My daughter is 20 months old and she urinates frequently.  I took her to her pediatrician and a CMP was performed.  All of her test were fasted because I am concerned about juvenile diabetes because of family history.  To my surprise, her glucose levels were excellent but I am concerned about her kidney function.  Her urea nitrogen (BUN) level was 24mg/dL, BUN/Creatinine Ratio was 92 and her creatinine was .26mg/dL. I realize that increased levels may be due to dietary intake but this is a concern because kidney disease is prevalent in my family due to factors of high blood pressure and diabetes.  I'm not sure of her intake at daycare but at home, I try to incorporate a balanced meal.  Her pediatrician did not call me with the results.  I obtained them online but should I be concerned?  I would think that with levels this high in a 20 month old, he would have mentioned the levels.

Answer
Hi, Alana,

In a healthy child, the BUN/creatinine ratio is a fairly useless test.  The BUN can be slightly high due to simply not having enough to drink and the creatinine, the real marker in kids of kidney disease is totally normal.  The BUN/Creatinine ratio is much more often used in adult medicine.  Sounds like he didn't call because all if fine.

Good luck, Dr. Olson

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David Olson, MD

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I would be happy to attempt to answer any questions about general pediatric topics, either medical issues or behavioral issues. This would include all the various questions one receives in a busy pediatric practice. I`m a board certified pediatrician in northern Michigan and have been in practice for over 15 years. I enjoy the teaching role I have in our practice and would enjoy the opportunity to help others with their pediatric problems.

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