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Child having elevated BUN post treatment for viral fever. Worrisome?

My grandson is 2.5 yrs old. His creat is within normal range. His BUN is 20. It was 21 a week ago following a week of fever from a virus of unknown origin. Appears very healthy. Pediatrician was very wconcerned with the first reading of 21 and now is saying the last lab of 20 is probably ok. The labs normal says up to 12 is normal range. Should we be concerned?
Thu, 26 Jul 2012
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Pathologist and Microbiologist 's  Response
Hello Sir! BUN(blod urea nitrogen) is a normal product of breakdown of proteins both in diet as well as body.As the normal kidneys excrete urea efficiently so it rarely exceeds 20 in patients without any kidney disease.The levels can rise when the ability of the kidneys to excrete urea is impaired or when protein breakdown is increased.The levels of BUN vary with age and in children normal levels are 5to 18mg/dL.Creatinine is also a waste product which is excreted by the kidneys, so levels of creatinine are also carried on along with the BUN. Since in your case creatinine is within normal range and this test is more accurate than the BUN .So nothing much to worry .Have a nice day!
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