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Interpret Your Blood Urea Nitrogen Results
Enter your BUN value below and get an instant, free AI interpretation — a plain-English explanation checked against WHO/IFCC reference ranges.
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This AI-generated interpretation is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Results may vary based on individual health factors not captured here.
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Blood Urea Nitrogen Normal Ranges
BUN measures the amount of nitrogen in urea, a waste product formed in the liver from protein metabolism.
| Age Group | Reference Range | Unit | Notes |
|---|---|---|---|
| Adults (18–64) | 7 – 20 | mg/dL | — |
Also reported in: mmol/L.
Common Causes of High BUN
Dehydration and pre-renal azotemia (disproportionate BUN rise)Kidney disease (elevated BUN + creatinine)High protein diet
Common Causes of Low BUN
Liver failure (urea synthesis reduced)Malnutrition or very low protein dietOverhydration
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