A love affair with cigars is like most affairs of the heart. We swoon over the beauty and elegance, but we never really know what makes us love--and we don't want to. To overanalyze a cigar, or a mate, is to destroy the mystery.
A blood urea nitrogen (BUN) test measures the amount of nitrogen in your blood that comes from the waste product urea. Urea is made when protein is broken down in your body. Urea is made in the liver and passed out of your body in the urine. A BUN test is done to see how well your kidneys are working.
A blood urea nitrogen, or BUN, test is used to gauge the amount of nitrogen in the blood of a person. It also helps to understand how well the liver and kidneys are functioning, as stated by the Mayo Clinic. If the urea nitrogen levels are high in the blood, it shows that the kidneys are not functioning properly. A person is advised not to consume a lot of meat or other protein-rich food 24 hours prior the test. A BUN test may be conducted together with a creatinine test.