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biochemistryHas Critical Values
Blood Urea Nitrogen
BUN· also: Urea, Blood Urea
Clinical Overview
BUN measures the amount of nitrogen from urea in blood. Elevated BUN can indicate kidney disease, dehydration, high protein diet, or GI bleeding.
Reference RangesWHO/IFCC standards
| Age Group | Reference Range | Unit | Notes |
|---|---|---|---|
| Adults (18–64) | 7 – 20 | mg/dL | — |
Also reported in: mmol/L.
Critical (Panic) Values
Critical High: > 100 mg/dL. Values outside these limits require immediate clinical attention.
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Related Topics
kidneyrenalRFTurea