Kidney
BUN (Blood Urea Nitrogen)
BUN measures the amount of urea nitrogen in the blood. Urea is a waste product formed when the liver breaks down protein. The kidneys filter and excrete urea.
Elevated BUN can indicate kidney dysfunction, dehydration, high protein intake, or GI bleeding.
What It Measures
Blood urea nitrogen levels reflecting kidney function and protein metabolism.
Reference Ranges
| Status | Range (mg/dL) |
|---|---|
| Optimal | 7–18 mg/dL |
| Normal | 6–20 mg/dL |
| Borderline | 20–30 mg/dL |
| Out of Range | > 30 mg/dL |
How GATOR Tracks This
Lab Providers
Function HealthLabCorpQuest
Related Clinical Ratios
BUN/Creatinine
Related Biomarkers
This content is for informational purposes only and does not constitute medical advice. Reference ranges may vary by laboratory and individual factors. Consult a qualified healthcare provider for interpretation of your results and treatment decisions.
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