A Blood Urea Nitrogen (BUN) test measures the amount of urea nitrogen in your blood. Urea nitrogen is a waste product produced by the liver when the body breaks down protein. The kidneys normally filter urea nitrogen out of the blood and into the urine. An elevated BUN level may indicate impaired kidney function, while a low level might suggest liver disease or malnutrition. This test is often used in conjunction with creatinine to assess kidney health.
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2 mL (0.5 mL min.) Serum from 1 SST. Ship refrigerated or frozen.