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BUNmg/dL
BUN (blood urea nitrogen) is a waste product cleared by the kidneys. It also shifts with hydration and protein intake.
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What BUN measures
BUN (blood urea nitrogen) is a waste product cleared by the kidneys. It also shifts with hydration and protein intake.
If your BUN is low
BUN below the range is commonly associated with low protein intake, overhydration or pregnancy, and is rarely a concern on its own.
Commonly associated with
- Low protein intake
- Overhydration
- Pregnancy
- Liver function
If your BUN is high
BUN above the range is commonly associated with dehydration, a high-protein diet or reduced kidney filtration; it is read together with creatinine.
Commonly associated with
- Dehydration
- High protein intake
- Reduced kidney filtration
- Some medications
Typical reference range
| Group | Typical range |
|---|---|
| Adults | 7 – 25 mg/dL |
Typical adult values used by many US labs. Your own report prints the range your lab validated for its method, and that range is the one that counts. Labwise always uses the printed range first.
If it is within range
Your BUN is within the range printed by your lab.
Also listed as
Urea Nitrogen (BUN), Urea Nitrogen, Blood Urea Nitrogen, BUN, Serum
Related tests
This page is general information about what a laboratory test measures and what results outside a reference range are commonly associated with. It is not medical advice, does not diagnose any condition and does not replace your clinician. Discuss your results with your healthcare provider.