Information about a laboratory test
High BUN can occur with reduced kidney function, dehydration, increased protein breakdown or gastrointestinal bleeding.
Measures the amount of nitrogen in blood that comes from urea, a waste product of protein metabolism.
Commonly interpreted with creatinine to help assess kidney function, hydration and selected metabolic contexts.
Low BUN can occur with low protein intake, excess body water or severe impairment of liver urea production, among other causes.
High BUN can occur with reduced kidney function, dehydration, increased protein breakdown or gastrointestinal bleeding.
Start with the performing laboratory's reference interval, unit and specimen conditions. Numeric information on this page is stored as sourced example intervals or clinical thresholds.
>= 6 – <= 20 mg/dL
Example adult BUN reference interval
The source presents these values as a common example reference interval. Laboratory method, age and clinical context can change the range; the user's own report takes priority.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
BUN is not kidney-specific. Creatinine, eGFR, hydration and the clinical context should be considered together.
Comprehensive Metabolic Panel — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Example adult intervals for ALT, AST, ALP, albumin, bilirubin, total protein, BUN, creatinine and electrolytes · Verified: Aug 12, 2026
Creatinine Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Creatinine limitations and use with eGFR, BUN and urine testing · Verified: Aug 12, 2026
BUN - Blood Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · BUN meaning, kidney/liver/hydration context and example interval · Verified: Aug 12, 2026
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