A BUN test, also known as a blood urea nitrogen test, is a laboratory test that measures the amount of urea nitrogen in the blood. Urea nitrogen is a waste product that is produced when protein is broken down in the body. The test is typically ordered to help evaluate kidney function, as the kidneys are responsible for removing urea nitrogen from the blood. The test may also be ordered to help diagnose and monitor conditions such as dehydration, kidney disease, or liver disease. The BUN test is performed on a blood sample taken from a vein in the arm.
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