Kidney function test: What do elevated creatinine and BUN indicate?

content provided by mayoclinic.com

Kidney function test: What do elevated creatinine and BUN indicate?

Question

Recent kidney function tests revealed that I have elevated creatinine and BUN levels. What does this mean?

Sandy
Florida

Answer

Elevated creatinine and blood urea nitrogen (BUN) levels are likely evidence of decreased kidney function. Creatinine and urea nitrogen are waste products that your kidneys normally remove from your blood. If your kidneys are not working properly, these substances may build up in your blood. Kidney function tests include blood tests that measure creatinine and urea nitrogen.

If you have elevated creatinine and BUN, your doctor will likely recommend additional tests to further evaluate your kidney function. Tests may include:

  • Urine tests to look for increased protein, red blood cells and casts in your urine as indicators of impaired kidney function
  • Glomerular filtration rate to determine your kidney function as a percent of normal

Last Updated: 03/30/2007
© 1998-2014 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "MayoClinic.com," "Mayo Clinic Health Information," "Reliable information for a healthier life" and the triple-shield Mayo logo are trademarks of Mayo Foundation for Medical Education and Research.

Terms and conditions of use

 

Bookmark and Share   E-Mail Page   Printer Friendly Version