Blood Urea Nitrogen

BUN

Overview

It is done to evaluate the health of your kidneys. It can be done as a part of basic metabolic panel or when you have signs or symptoms suggestive of kidney disease like swelling of face, ankle, lower back pain, changes in urine output etc. It should also be done to monitor the treatment if you are already diagnosed with a kidney disease or in dialysis patients. The test may also be ordered prior to or during certain drug treatment to monitor the kidney function. 

Sample
Precautions
Symptoms
  • Increased BUN level suggest kidney dysfunction which may be due to acute or chronic kidney disease, or rarely due to congestive heart failure, stress, shock, dehydration etc
  • Low BUN levels are not common and usually not a cause for concern. It may be seen in severe liver disease or malnutrition.

Common questions regarding 'Blood Urea Nitrogen'

BUN and Creatinine are two primary tests which are used to test kidney function.
Yes, high protein diet can lead to increased BUN levels.
Urea is a waste product of the kidneys and BUN measures the amount of nitrogen in a given amount of urea. The formula to convert BUN into urea is nUrea = BUN X 2.14
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