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Urea Nitrogen (BUN)

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The Blood Urea Nitrogen (BUN) test measures the amount of urea nitrogen present in the blood.

  • Sample Type: Blood
  • Results: 1-2 days
  • Age: 18+

Urea is the principle waste product of protein catabolism. BUN is most commonly measured in the diagnosis and treatment of certain renal and metabolic diseases. Increased BUN concentration may result from increased production of urea due to (1) diet or excessive destruction of cellular proteins as occurs in massive infection and fevers, (2) reduced renal perfusion resulting from dehydration or heart failure, (3) nearly all types of kidney disease, and (4) mechanical obstruction to urine excretion such as is caused by stones, tumors, infection, or stricture. Decreased urea levels are less frequent and occur primarily in advanced liver disease and in overhydration.

The BUN test specifically checks for the concentration of urea nitrogen in the blood, which can be an indicator of kidney function. Elevated levels might suggest that the kidneys are not effectively eliminating urea from the blood, while low levels can have other implications.

No special preparation required

Quest test codes: 294


+ service fee

Price does not include the Physician Service Fee () and the Lab Collection Fee ($9). These non-refundable fees cover the ordering and oversight of lab tests and follow-up services when appropriate.

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Provided by Quest Diagnostics
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  • Order Tests Online

    No doctor visit required for purchase. Choose from a wide range of panels and tests. Pay online with a credit or debit card — no insurance needed.
  • Go to the Lab for Sample Collection

    Complete your test sample collection during your scheduled appointment.
  • Get Fast Results Online

    We will email you when your results are ready. Access your Confidential Lab Record by logging in to your account. There you can view, save and print your results.

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Frequently Asked Questions

The Blood Urea Nitrogen (BUN) Test works by collecting a blood sample and measuring levels of BUN. Abnormally high levels generally point to problems with your kidneys. 

Your provider may order a blood test for candida antibodies to diagnose the overproduction of candida caused by either the disruption of healthy bacteria or a compromised immune system. Some factors may include pregnancy, antibiotic use, birth control pills, diabetes, immunosuppression, or HIV infection. 

Your provider may wish to order a Blood Urea Nitrogen (BUN) Test if you’re exhibiting symptoms of kidney disease, such as:  

  • Urinating more or less
  • Nausea or vomiting 
  • Loss of appetite
  • Muscle cramps

You cannot take a Blood Urea Nitrogen (BUN) Test at home — this test can only be administered by a medical professional at a licensed testing facility. 

Once you receive the results of your blood test for Blood Urea Nitrogen (BUN), you will need to consult with your provider. Only a medical professional can advise you on your BUN levels and help you develop a treatment plan if necessary. 

Your BUN levels may fluctuate over time, depending on a variety of factors that could impact your liver or kidney function. A blood test for BUN can help monitor these changes over time. 

There are no special requirements for the Blood Urea Nitrogen (BUN) Test. Your provider will draw a blood sample from a vein in your arm. Blood Urea Nitrogen (BUN) Test results typically only take 1-2 business days to process. 

The cost of a Blood Urea Nitrogen (BUN) Test listed on Tripment Health is transparent and final — you will never be asked to pay additional fees at the testing facility, or receive a surprise bill down the road. 

Tripment Health has partnered with nearly 7,000 lab test facilities across 48 states. Finding a Blood Urea Nitrogen (BUN) Test, current procedural technology (cpt) code 294, is easier than ever. Add the lab tests you need to your cart, then select a testing facility conveniently close to you.