Blood Urea Nitrogen (BUN), Serum
Blood Urea Nitrogen (BUN) Test
The Blood Urea Nitrogen (BUN), Serum test measures the amount of urea nitrogen present in the blood. Urea is a waste product formed in the liver when the body breaks down proteins, and it is removed from the body through the kidneys. This test is commonly used to evaluate kidney function, hydration status, and overall metabolic health.
Why is this test done?
The BUN test is recommended to:
- Assess kidney function and monitor kidney diseases
- Evaluate dehydration or fluid imbalance
- Monitor liver function and protein metabolism
- Check the effectiveness of dialysis treatment
- Investigate symptoms such as fatigue, swelling, nausea, or reduced urine output
Normal Range
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Adults: Approximately 7 – 20 mg/dL
(Normal values may vary slightly depending on laboratory standards.)
Increased BUN Levels May Indicate:
- Kidney dysfunction or kidney failure
- Dehydration
- High protein diet
- Heart failure
- Gastrointestinal bleeding
Decreased BUN Levels May Indicate:
- Severe liver disease
- Malnutrition
- Overhydration
- Low protein intake
Sample Required
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Sample Type: Serum
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Preparation: Fasting may be advised in some cases, as directed by the physician.
Reporting Time
Early evaluation of BUN levels helps in detecting kidney-related conditions and maintaining overall health.
