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

ANSWER

Low BUN levels are rare. If you have low BUN levels, it could indicate:

That said, a BUN test can't diagnose these issues, so you may need more tests.

  • Liver disease
  • Malnutrition (when your diet doesn’t have enough nutrients or your body can’t take them in well)
  • Overhydration (having too much fluid)

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

NEXT QUESTION:

When is a creatinine test used in addition to blood urea nitrogen (BUN) tests?

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