A blood urea nitrogen (BUN) test is used to determine how well your kidneys are working. It does this by measuring the amount of urea nitrogen in the blood. Urea nitrogen is a waste product that’s created in the liver when the body breaks down proteins. Normally, the kidneys filter out this waste, and urinating removes it from the body.
A BUN test is a blood test most commonly used to evaluate kidney function. It’s often done along with other blood tests, such as a creatinine blood test, to make a proper diagnosis.
Normal Range: adult men: 8 to 24 mg/dL
adult women: 6 to 21 mg/dL
children 1 to 17 years old: 7 to 20 mg/dL
