Reasons you may not be able to
have the test or why the results may not be helpful include:
Taking medicines, such as amphotericin B (such
as Fungizone), nafcillin, aminoglycosides, kanamycin (Kantrex), tobramycin
corticosteroids, tetracycline antibiotics, and, rarely,
the antibiotic chloramphenicol (Chloromycetin).
Your sex. Women and children have lower BUN levels than
What To Think About
A BUN test may be done with a blood
creatinine test. Blood urea nitrogen (BUN) and
creatinine tests can be used together to find the BUN-to-creatinine ratio
(BUN:creatinine). For more information, see the topic
Creatinine and Creatinine Clearance.
levels may be measured regularly in people who have
kidney dialysis. BUN levels are used to see how well
dialysis is working.
glomerular filtration rate may be done for people with
chronic kidney disease to regularly check how well the kidneys are
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis:
Fischbach FT, Dunning MB III, eds. (2009).
Manual of Laboratory and Diagnostic Tests, 8th ed.
Philadelphia: Lippincott Williams and Wilkins.
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.
Primary Medical Reviewer
Anne C. Poinier, MD - Internal Medicine
Specialist Medical Reviewer
Tushar J. Vachharajani, MD, FASN, FACP - Nephrology