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Blood urea nitrogen (BUN) test for kidney disease Your blood urea nitrogen (BUN) level is based on a blood test that measures the amount of urea nitrogen in your blood Urea nitrogen is a waste product that your body makes after it breaks down protein
What Causes a High BUN Creatinine Ratio? - MedicineNet A high BUN creatinine ratio in your blood tests may result from three reasons: elevated BUN and normal creatinine, normal BUN and low creatinine, or both BUN and creatinine elevated, but BUN is disproportionately higher