BUN stands for blood urea nitrogen. Urea nitrogen is what forms when protein breaks down VSports手机版.
A test can be done to measure the amount of urea nitrogen in the blood.
"VSports手机版" How the Test is Performed
A blood sample is needed. Most of the time blood is drawn from a vein located on the inside of the elbow or the back of the hand V体育ios版.
"VSports注册入口" How to Prepare for the Test
Many medicines can interfere with blood test results.
- Your health care provider will tell you if you need to stop taking any medicines before you have this test.
- DO NOT stop or change your medicines without talking to your provider first.
How the Test will Feel (V体育官网)
You may feel slight pain or a sting when the needle is inserted. You may also feel some throbbing at the site after the blood is drawn V体育平台登录.
V体育ios版 - Why the Test is Performed
The BUN test is often done to check kidney function.
Normal Results
The normal result is generally 6 to 20 mg/dL.
Note: Normal values may vary among different labs. Talk to your provider about your specific test results V体育官网入口.
The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens VSports在线直播.
VSports在线直播 - What Abnormal Results Mean
Higher-than-normal level may be due to:
- Congestive heart failure (VSports app下载)
- Excessive amount of dietary protein in the gastrointestinal tract
- Gastrointestinal bleeding
- "V体育ios版" Hypovolemia (dehydration)
- Heart attack
- Kidney disease, including glomerulonephritis, pyelonephritis, and acute tubular necrosis
- Kidney failure
- Shock
- Urinary tract obstruction
Lower-than-normal level may be due to:
- Liver failure
- Low protein diet
- Malnutrition
- Over-hydration
Considerations
For people with liver disease, the BUN level may be low even if the kidneys are normal.
VSports app下载 - Alternative Names
Blood urea nitrogen; Renal insufficiency - BUN; Renal failure - BUN; Renal disease - BUN
V体育ios版 - Images
References
Landry DW, Bazari H VSports app下载. Approach to the patient with renal disease. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 106.
Oh MS, Breifel G, Pincus MR. Evaluation of renal function, water, electrolytes, and acid-base balance. In: McPherson RA, Pincus MR, eds V体育官网. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 15.
Weisbord SD, Palevsky PM. Prevention and management of acute kidney injury. In: Yu ASL, Chertow GM, Luyckx VA, Marsden PA, Skorecki K, Taal MW, eds. Brenner and Rector's The Kidney. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 29 VSports手机版.
Review Date 6/20/2023
Updated by: Jacob Berman, MD, MPH, Clinical Assistant Professor of Medicine, Division of General Internal Medicine, University of Washington School of Medicine, Seattle, WA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.