BUN: Results and Values (Blood Urea Nitrogen)

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Alternate Names : Blood Urea Nitrogen

Normal values for BUN are 7 to 20 milligrams per deciliter (mg/dl) of blood.

Levels lower than normal may indicate:

liver failure

a diet too low in protein

overhydration, or too much fluid in the body

Levels higher than normal may indicate:

starvation

eating too much protein

gastrointestinal bleeding

burns

dehydration, or not having enough fluids in the body

myocardial infarction, or heart attack

kidney disease

obstruction of the urinary tract

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BUN: Preparation & Expectations

Author: David T. Moran, MD
Reviewer: H. William Kelly, PharmD
Date Reviewed: 04/17/01

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