Healthy kidneys then filter the urea and remove other waste products like urea through urination. The nitrogen comes from the waste product urea, which is converted from nitrogen and produced in the liver when protein is metabolized after eating. Note: If results for BUN and Creatinine are both within the normal reference range, the BUN/Creatinine ratio will not be reported (not applicable).Ī Blood Urea Nitrogen (BUN) test measures the amount of nitrogen in your blood, and is used to provide doctors with information on how well your kidneys and liver are functioning. However, the BUN to creatinine ratio may be used as an indirect estimate of renal function. Most clinicians agree that creatinine is a more specific indicator of glomerular function than BUN. The BUN and creatinine tests alone are excellent methods of testing liver and kidney health, but together, doctors get a much better understanding of your kidney health and can provide a more accurate diagnosis to kidney-related issues. Once a person performs both a BUN and Creatinine test, doctors can use the combined results to find the BUN-to-creatinine ratio. The Blood urea nitrogen (BUN): Creatinine Ratio is a renal (related to kidneys) function indicator, commonly used to diagnose acute or chronic renal (kidney) disease or damage.īlood Urea Nitrogen (BUN) and creatinine are both waste products of normal metabolism in the human body.īUN represents the amount of nitrogen produced from the metabolism of proteins.Ĭreatinine is a normal waste product of muscle.
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