Urea Nitrogen Kidney Function. Urea nitrogen is a normal waste product in your blood that comes from the breakdown of protein from the foods you eat and from your body metabolism. It is produced in the liver and excreted by the kidneys.
The urea travels from your liver to your kidneys through your bloodstream. It may also be due to a condition that results in decreased blood flow to the kidneys such as congestive heart failure shock stress recent heart attack or severe burns to conditions that cause. It contains two nitrogen atoms and is the end product of protein and nitrogen metabolism.
Healthy kidneys filter urea and remove other waste products from your blood.
Blood urea nitrogen bun. Blood urea nitrogen bun bun is primarily a measurement of urea nitrogen in the blood produced by the breakdown of proteins and can be used as a test of renal function. Some factors enhance urea production such as gastrointestinal bleeding corticosteroid therapy and high protein diet and limit the utility of bun in assessing kidney function. It is produced in the liver and excreted by the kidneys.