• Test Code - PL0224
  • Test Name - Blood Urea Nitrogen (BUN)
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Test Details & Preparation


  • The blood urea nitrogen or BUN test is primarily used, along with the creatinine test, to evaluate kidney function in a wide range of circumstances, to help diagnose kidney disease, and to monitor people with acute or chronic kidney dysfunction or failure.

  • The blood urea nitrogen or BUN test may also be used to gauge a person's general health status when ordered as part of a renal panel, basic metabolic panel (BMP) or comprehensive metabolic panel (CMP).

  • The blood urea nitrogen test is often ordered with creatinine or renal panel when kidney problems are suspected.

  • The blood urea nitrogen test may also be ordered to monitor kidney function in those with chronic diseases or conditions such as diabetes, congestive heart failure, and myocardial infarction (heart attack).

  • The blood urea nitrogen test may also be ordered to monitor the effectiveness of dialysis.

  • A blood sample is drawn from a vein in the arm for a blood urea nitrogen test.

  • No test preparation is required for a blood urea nitrogen test.

  • Increased blood urea nitrogen levels suggest impaired kidney function. This may be due to acute or chronic kidney disease, damage, or failure.

  • Low blood urea nitrogen levels are not common and are not usually a cause for concern. They may be seen in severe liver disease, malnutrition, and sometimes when a person is over-hydrated (too much fluid volume), but the blood urea nitrogen test is not usually used to diagnose or monitor these conditions.


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