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Overview
The Blood Urea Nitrogen (BUN) test measures the level of nitrogen in your blood that comes from urea, a waste product formed in the liver when protein is metabolized. The kidneys filter urea, and its levels can indicate kidney hea...
Risk assessment
Risk Assessment
Risks are minimal and include:
- Slight pain or bruising at the blood draw site.
- Rare risk of infection or lightheadedness after the test.
Ranges
Normal Range
- Adults: 7–20 mg/dL (varies slightly by lab).
- Children: Typically lower than adults.
Test result interpretation
Interpretation of Results
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Elevated BUN may indicate:
- Kidney disease or failure.
- Dehydration.
- High protein intake.
- Heart failure or recent heart attack.
Sample types
Sample Type
- Specimen Required: Blood sample drawn from a vein (venipuncture).
- Preparation: No fasting is usually required unless specified. However, inform your doctor abou...
Frequently Asked Questions
What is BUN?
Why is a BUN test done?
What are normal BUN levels?
What can cause elevated BUN levels?
What can cause low BUN levels?
How is the BUN test performed?
Do I need to prepare for a BUN test?
Are there any risks to the BUN test?
What do abnormal BUN test results mean?
Can medications affect BUN levels?
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BUN
Evaluating Renal Function and Nitrogen Balance for Health Assessment
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Sample Type:
blood
Fasting Required:
No
Description
A BUN test is typically obtained with other blood tests to assess kidney function. When the kidneys are not working correctly, blood urea nitrogen increases as less urea gets excreted in the urine. However, urea production can vary independently of kidney function, so a BUN test is less practical than creatinine to assess kidney health. BUN is often combined with creatinine to obtain the ratio of BUN to creatinine, which can help determine renal failure.
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