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.
BUN is part of both the BMP and CMP, groups of tests that are widely used: 1  As part of a routine health checkup. 2  To check how the kidneys are functioning before starting to take certain drug therapies.  When an acutely ill person comes to the emergency room and/or is admitted to the hospital.