Print By Mayo Clinic Staff Request an appointment About Aug. 05, 2023 Print Show references Mayo Clinic Laboratories. Blood urea nitrogen (BUN), serum. https://www.mayocliniclabs.com/test-catalog/Clinical+and+Interpretive/81793. Accessed April 17, 2021. Rodwell VW, et al. Catabolism of proteins & of amino acid nitrogen. In: Harper's Illustrated Biochemistry. 31st ed. McGraw-Hill Education; 2018. https://accessmedicine.mhmedical.com. Accessed April 17, 2021. Lab Tests Online. Blood urea nitrogen. https://labtestsonline.org/understanding/analytes/bun/tab/test/. Accessed April 17, 2021. AskMayoExpert. Kidney disease (adult). Mayo Clinic; 2019. Inkler LA, et al. Assessment of kidney function. https://www.uptodate.com/contents/search. Accessed April 17, 2021. National Kidney Foundation. KDIGO 2012 clinical practice guidelines for the evaluation and management of chronic kidney disease. Kidney International Supplements. 2013;3:5. Chebib FT (expert opinion). Mayo Clinic. April 19, 2021. Related Diabetic coma News from Mayo Clinic Mayo Clinic Q & A: What to expect during a blood draw April 29, 2024, 12:46 p.m. CDT Products & Services A Book: Mayo Clinic Family Health Book Newsletter: Mayo Clinic Health Letter — Digital Edition Show more products and services from Mayo Clinic Blood urea nitrogen (BUN) testAbout PRC-20198841 Patient Care & Health Information Tests & Procedures Blood urea nitrogen (BUN) test