(Tıp, İlaç) The blood urea nitrogen (BUN, pronounced "B-U-N") test is a measure of the amount of nitrogen in the blood in the form of urea, and a measurement of renal function. Urea is a by- product from metabolism of proteins by the liver and is removed from the blood by the kidneys
(Medicine) waste product created during the metabolic process and excreted into the blood (can be used as an indication of renal function), BUN