What is the normal range for Blood Urea Nitrogen (BUN)?

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Multiple Choice

What is the normal range for Blood Urea Nitrogen (BUN)?

Explanation:
BUN measures nitrogen in urea and reflects how well the kidneys are filtering waste. In healthy adults, the usual reference range is about 7–20 mg/dL, with many labs listing 8–21 mg/dL as a standard. The range 8–21 mg/dL sits squarely inside that normal window, making it the normal value. Values higher than this may indicate dehydration or kidney dysfunction, while values much lower (like 0–5 mg/dL or 2–10 mg/dL) can occur with severe liver disease, malnutrition, or overhydration.

BUN measures nitrogen in urea and reflects how well the kidneys are filtering waste. In healthy adults, the usual reference range is about 7–20 mg/dL, with many labs listing 8–21 mg/dL as a standard. The range 8–21 mg/dL sits squarely inside that normal window, making it the normal value. Values higher than this may indicate dehydration or kidney dysfunction, while values much lower (like 0–5 mg/dL or 2–10 mg/dL) can occur with severe liver disease, malnutrition, or overhydration.

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