The Blood Urea Nitrogen (BUN) test measures the level of urea nitrogen in the blood, which is a waste product formed from the breakdown of proteins in the liver. This test is primarily used to assess kidney function, as elevated BUN levels can indicate impaired kidney performance or dehydration, while low levels may suggest liver disease or malnutrition. BUN is often measured alongside creatinine to provide a comprehensive evaluation of renal health. A blood sample is required for this test, and results are interpreted in conjunction with clinical findings and other laboratory tests to guide diagnosis and management of kidney-related conditions.
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