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 normally removed from your blood by your kidneys but when kidney function slows down the bun level rises. Individual labs may have reference ranges that vary slightly and can be different based on sex or age.
Conditions that cause obstruction of urine.
Blood creatinine can be used to estimate the egfr using age sex and race. Blood creatinine can be used to estimate the egfr using age sex and race. This is often calculated by computer and reported with the creatinine blood test. It gives your doctor an idea of how much.
