Kidney
Blood Urea Nitrogen
A measure of urea nitrogen in the blood, often used in kidney testing.
kidneyproteinmetabolismelectrolytes
About this biomarker
Blood urea nitrogen, or BUN, reflects a waste product formed when the body breaks down protein. It is cleared by the kidneys and is often read with creatinine.
Why it matters
It adds context to kidney function, hydration, and protein metabolism.
What lower levels may suggest
Low BUN may be seen with low protein intake, liver disease, or overhydration.
What higher levels may suggest
High BUN may be seen with reduced kidney function, dehydration, high protein intake, or gastrointestinal bleeding.
Common tests
Basic metabolic panel, comprehensive metabolic panel, kidney function panel
Related biomarkers
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