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blood urea nitrogen (BUN or AZO) test A common test in a chemistry panel that measures the amount of nitrogen in the blood that comes from the waste product urea.  It can be used to see how well the kidneys and liver are working and if dehydration is present. ► click here to learn more-link provided by: University of Georgia College of Veterinary Medicine Related Words blood  ;  chemistry panel  ;  kidney  ;  liver