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.
Those three letters stand for blood, urea, and nitrogen. A BUN test measures the level or urea nitrogen present in your blood, and can contain important information about the status of your kidneys and liver. The BUN test is usually ordered if your doctor needs to evaluate your kidney function, or suspects kidney damage.