Urea (or BUN, blood urea nitrogen) is a waste product from protein breakdown, filtered by the kidneys. It is read alongside creatinine.
| Measure | Range |
|---|---|
| Blood urea | 15–40 mg/dL |
| BUN | 7–20 mg/dL |
They measure the same thing reported differently — BUN counts only the nitrogen part. BUN ≈ urea ÷ 2.14. Use whichever your lab reports, against its range.
No — dehydration and a high-protein meal commonly raise it. It is most useful read together with creatinine and eGFR.
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