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- $Unique_ID{BRK01903}
- $Pretitle{}
- $Title{What is the "BUN"?}
- $Subject{BUN blood kidney kidneys urea nitrogen checkup checkups examine
- examination examinations creatinine uric acid renal artery urine chemical
- chemicals test tests tested testing urea-nitrogen}
- $Volume{}
- $Log{
- Anatomy of the Kidney*0004801.scf
- Cross Section of a Kidney*0004901.scf
- Formation of Urine*0015901.scf
- Kidney Nephrons*0004902.scf}
-
- Copyright (c) 1993 Tribune Media Services, Inc.
-
-
- What is the "BUN"?
-
-
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-
- QUESTION: Every year my brother has to take a physical for the company he
- works for. In the report from the hospital it showed his "BUN" from the blood
- test was 25, and higher than normal. I know it has something to do with his
- kidneys, and that kidney problems put our father on a machine for the last
- year of his life. Can you give us more information?
-
- ------------------------------------------------------------------------------
-
- ANSWER: Your past experiences with your father have left you with an
- understandable anxiety and concern for your brother, but the information
- contained in your letter is not as frightening as you now believe. To start
- with, a finding of 25 for the BUN (blood urea nitrogen) is at the upper end of
- the normal range. Most of the blood tests taken during annual checkups are
- "screening" examinations, and any abnormal result should be followed up by
- another, perhaps more specific analysis.
- One of the major functions of the kidney is to rid the body of waste
- products. These substances include urea, creatinine and uric acid. When the
- blood enters the kidney by way of the renal artery, these substances are
- filtered out of the blood, and are transferred into the urine. When the urine
- passes out of the body, these unwanted substance are carried right along.
- However, when the kidney is not properly doing its job, these undesirable
- chemicals are not removed from the blood, and when blood is examined, a higher
- amount than normal is detected. However, the presence of these additional
- quantities do not tell us just what is ailing the kidney, merely that all the
- waste has not been removed. It takes some additional testing of both urine
- and blood, as well as special x-ray techniques to narrow down the range of
- possible causes, until finally a diagnosis can be made, and treatment started.
- But you're a long way from there at present. The chances are very much
- in your favor, since the result of this original screening is still in normal
- range, that a repeat test will show a lower level of BUN. At the same time
- additional tests such as creatinine may reveal that, after all, your brother's
- kidneys are still working as they should.
-
- ----------------
-
- The material contained here is "FOR INFORMATION ONLY" and should not replace
- the counsel and advice of your personal physician. Promptly consulting your
- doctor is the best path to a quick and successful resolution of any medical
- problem.
-