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 BUN test uses a blood sample to check blood urea nitrogen levels. As the waste product of protein digestion, the liver and kidneys influence blood urea nitrogen levels heavily. Urea is released by the liver into the blood and sent to the kidneys to be removed in the urine.