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By Mayo Clinic staffBlood urea nitrogen is a common blood test. If your blood sample is being tested only for blood urea nitrogen, you can eat and drink normally before the test. If your blood sample will be used for additional tests, you may need to fast for a certain amount of time before the test. Your doctor will give you specific instructions.
- Blood urea nitrogen. In: Nicoll D, et al. Pocket Guide to Diagnostic Tests. 5th ed. New York, N.Y.: McGraw-Hill Companies; 2008. http://www.accessmedicine.com/popup.aspx?aID=3135548&searchStr=blood urea nitrogen. Accessed Oct. 21, 2008.
- Your kidneys and how they work. National Kidney and Urologic Diseases Information Clearinghouse. http://kidney.niddk.nih.gov. Accessed Oct. 22, 2008.
- Lab Tests Online: BUN. American Association for Clinical Chemistry. http://labtestsonline.org/understanding/analytes/bun/test.html. Accessed Oct. 22, 2008
- Stevens L, et al. Assessment of kidney function: Serum creatinine; BUN; and GFR. http://www.uptodate.com/home/index.html. Accessed Oct. 22, 2008.
- Palevsky PM. Dialysis modality and dosing strategy in acute renal failure. Seminars in Dialysis. 2006;19:165.
- Nally JV. Acute renal failure in hospitalized patients. Cleveland Clinic Journal of Medicine. 2002;69:569.
- Morgan GE, et al. Anesthesia for patients with renal disease. In: Morgan GE, et al. Clinical Anesthesiology. 4th ed. New York, N.Y.: McGraw-Hill Companies; 2006. http://www.accessmedicine.com/content.aspx?aID=892940. Accessed Oct. 21, 2008.
- Reference values. Blood urea nitrogen. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2008.
