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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.
References
- 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. Accessed Nov. 24, 2010.
- The kidneys and how they work. National Kidney and Urologic Diseases Information Clearinghouse. http://kidney.niddk.nih.gov/kudiseases/pubs/yourkidneys/index.htm#rate. Accessed Nov. 24, 2010.
- BUN. Lab Tests Online. http://labtestsonline.org/understanding/analytes/bun/test.html. Accessed Nov. 24, 2010.
- Stevens L, et al. Assessment of kidney function: Serum creatinine; BUN; and GFR. http://www.uptodate.com/home/index.html. Accessed Nov. 24, 2010.
- Palevsky PM. Dialysis modality and dosing strategy in acute renal failure. Seminars in Dialysis. 2006;19:165.
- Post TW, et al. Diagnostic approach to the patient with acute or chronic kidney disease. http://www.uptodate.com/home/index.html. Accessed Nov. 24, 2010.
- Laboratory reference values. Urea nitrogen (BUN). Rochester, Minn.: Mayo Foundation for Medical Education and Research; Nov. 2010.
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