What does "BUN" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
"BUN" stands for Blood Urea Nitrogen, a term used in medicine. It refers to a test that measures the amount of urea nitrogen, a waste product, in your blood. This test is used to check how well your kidneys are working. If the levels are too high or too low, it could indicate a problem with your kidneys or liver.
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