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How do I prepare for the blood urea nitrogen (BUN) test?

ANSWER

Before the blood test, tell your doctor what medications you’re taking. If any of them might alter the test result, your doctor may ask you to stop taking them for a period of time.

If you’re only getting a BUN test, you can eat and drink, but if you’re getting other blood tests, your doctor may give you directions that may include fasting before the test.

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 happens during the blood urea nitrogen (BUN) test?

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