Lab test
BUN/Creatinine Ratio Test
The BUN/creatinine ratio test measures blood urea nitrogen and creatinine and calculates the relationship between them.
- Typical price
- From $39
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
The BUN/creatinine ratio test measures blood urea nitrogen and creatinine and calculates the relationship between them. Both are waste products the kidneys filter, and their ratio can help a healthcare provider evaluate kidney function and distinguish between different causes of abnormal results. It may be ordered when kidney problems or dehydration are suspected, or to help assess gastrointestinal concerns. The test uses a blood sample. Results are interpreted alongside other kidney and metabolic tests.
What this test measures
- Blood urea nitrogen (BUN) A waste product that reflects kidney function and hydration.
- Creatinine A waste product filtered by the kidneys; a key marker of kidney function.
- BUN/creatinine ratio A calculated comparison of the two markers used to help identify causes of abnormal results.
Who this test may be right for
- People being evaluated for possible kidney disease or damage
- Individuals with symptoms such as dehydration, reduced urination, or swelling
- Those with abnormal kidney-related blood test results
- People whose healthcare provider is investigating gastrointestinal concerns
- Individuals being monitored for a known kidney condition
Before your visit
- Fasting for several hours may be requested; follow the instructions on your order
- Stay well hydrated unless your healthcare provider advises otherwise
- Tell the lab about medications that can affect kidney function
- Follow any specific instructions supplied with your test
Understanding your results
Results include the BUN level, the creatinine level, and the calculated ratio. A higher or lower BUN/creatinine ratio can point toward different explanations, such as dehydration, reduced kidney function, or other conditions, and is never interpreted on its own. The values are compared with reference ranges and with previous results. A healthcare provider explains what your BUN/creatinine ratio may mean in context. Discuss your results with a healthcare provider before making any decisions.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What do BUN and creatinine measure?
Blood urea nitrogen and creatinine are waste products filtered by the kidneys; measuring both, and their ratio, helps a healthcare provider assess kidney function and hydration status.
What does a high BUN/creatinine ratio suggest?
A high BUN/creatinine ratio can be associated with dehydration or other causes of reduced kidney blood flow, but it is interpreted with your symptoms, hydration, and other tests by a healthcare provider.
Does the BUN/creatinine ratio test require fasting?
Fasting for several hours may be requested; follow the specific preparation instructions supplied with your test order.
What does the BUN/Creatinine Ratio Test measure?
The BUN/Creatinine ratio blood test is used to diagnose acute or chronic renal (kidney) disease or damage.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most BUN/Creatinine Ratio Test results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
Laboratory services are provided by independent, CLIA-certified testing partners. Availability, pricing, and turnaround times can vary by location and are confirmed at checkout.