A BUN (Blood Urea Nitrogen) test measures the amount of urea nitrogen in your blood. Urea is a waste product formed in the liver when protein is metabolized, then filtered by the kidneys and excreted in urine.
What This Test Measures
Blood Urea Nitrogen (BUN):
A nitrogen-containing compound produced from protein breakdown. BUN levels reflect both kidney function and protein intake/metabolism.
Reference Range
Normal: 7-20 mg/dL (varies by age and laboratory)
Who Should Consider This Test
• Evaluating kidney function
• Monitoring chronic kidney disease
• Assessing dehydration
• Before starting medications that affect kidneys
• Part of routine health screening
• Monitoring high-protein diets
Interpreting Results
High BUN May Indicate:
• Kidney disease or decreased kidney function
• Dehydration
• High-protein diet
• Heart failure
• Gastrointestinal bleeding
• Certain medications
Low BUN May Indicate:
• Liver disease
• Malnutrition or low-protein diet
• Overhydration
BUN/Creatinine Ratio
BUN is often evaluated alongside creatinine. The ratio helps distinguish between kidney problems and other causes of elevated BUN:
• Normal ratio: 10:1 to 20:1
• Higher ratio may suggest dehydration, GI bleeding, or high protein intake
• Lower ratio may suggest liver disease or malnutrition
How It Works
1. Order your test online – no doctor visit required
2. Visit any Quest Diagnostics location nationwide
3. Simple blood draw takes approximately 5 minutes
4. Results delivered to your secure portal within 1-2 business days
Preparation
No fasting required.
Related Tests to Consider
• Creatinine – More specific kidney function marker
• Comprehensive Metabolic Panel – Includes BUN and creatinine
• Renal Function Panel – Focused kidney assessment
Why Choose Wittmer Rejuvenation Clinic
At $10.50, our BUN test is affordably priced. We partner with Quest Diagnostics for reliable, CLIA-certified laboratory testing.
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