Blood Urea Nitrogen (BUN)

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Measures urea nitrogen in blood, a waste product from protein breakdown. Results reflect kidney filtering and can change with hydration and diet.

Blood
15 min at lab
Results: 1 day

Typical Use

Used to help assess kidney function and hydration, often as part of a kidney panel or comprehensive metabolic panel, and to monitor kidney disease.

Preparation

Wear clothing that allows easy access to your arm
Arrive well-hydrated
Continue regular medications unless advised otherwise by your doctor

Markers Tested

BUN serum (mg/dL)

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