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What can affect blood urea nitrogen (BUN) test results?

ANSWER

Several things can affect your BUN test results, so having a BUN level that is lower or higher than the normal range doesn’t always mean there is a problem. Things that affect your BUN level might include:

  • High-protein diet (may cause high BUN levels)
  • Low-protein diet (may cause low BUN levels)
  • Several medications, including steroids and antibiotics (increased or decreased BUN levels)
  • Pregnancy
  • Aging

SOURCES:

American Association for Clinical Chemistry: "Blood Urea Nitrogen."

University of Rochester Medical Center: "Blood Urea Nitrogen."

National Kidney Foundation: "Tests to Measure Kidney Function."

Mayo Clinic: "Blood Urea Nitrogen Test," "Heart Failure."

Scripps Health Foundation: "BUN -- Blood Test."

U.S. National Library of Medicine: "Gastrointestinal Bleeding."

American Association for Clinical Chemistry: "Creatinine."

National Health Service (U.K.): "Malnutrition."

Reviewed by Nayana Ambardekar on March 09, 2019

SOURCES:

American Association for Clinical Chemistry: "Blood Urea Nitrogen."

University of Rochester Medical Center: "Blood Urea Nitrogen."

National Kidney Foundation: "Tests to Measure Kidney Function."

Mayo Clinic: "Blood Urea Nitrogen Test," "Heart Failure."

Scripps Health Foundation: "BUN -- Blood Test."

U.S. National Library of Medicine: "Gastrointestinal Bleeding."

American Association for Clinical Chemistry: "Creatinine."

National Health Service (U.K.): "Malnutrition."

Reviewed by Nayana Ambardekar on March 09, 2019

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What do high blood urea nitrogen (BUN) levels mean?

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