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 - blood test. BUN stands for blood urea nitrogen. Urea nitrogen is what forms when protein breaks down. A test can be done to measure the amount of urea nitrogen in the blood. A blood sample is needed. Most of the time blood is drawn from a vein located on the inside of the elbow or the back of the hand. Many medicines can interfere with blood test results.