Normal BUN, blood urea nitrogen, levels indicate proper functioning of the liver and kidneys, according to Mayo Clinic. The liver produces nitrogen when it breaks down protein, which along with other chemicals forms urea. Urea enters the bloodstream and moves to the kidneys, where it is filtered from the blood.Know More
A doctor may order a BUN test if he suspects kidney damage, notes Mayo Clinic. He may also order a BUN test as a part of a group of tests used to check for liver damage, gastrointestinal bleeding and other conditions.
When kidney function is impaired, BUN levels increase, according to the American Association for Clinical Chemistry. These levels also increase when an individual experiences obstructed urine flow or dehydration. A high-protein diet or excessive protein breakdown may also elevate BUN levels.Learn more about Diagnostics & Imaging
Normal blood levels may refer to the clinical values of blood components as indicated by a complete blood count test, as the Mayo Clinic describes. On the other hand, they may refer to the expected blood glucose value found in a healthy human being, according to WebMD.Full Answer >
Normal blood urea nitrogen levels generally range from 7 to 20 milligrams per deciliter, according to Mayo Clinic. This range, however, varies with age and the reference range that the laboratory uses. An individual needs to seek an explanation of his BUN test results from the doctor.Full Answer >
The most common causes of elevated liver enzymes include heart failure, alcohol use, certain prescription and over-the-counter medications, hepatitis and obesity, according to Mayo Clinic. Other causes include celiac disease, cirrhosis, liver cancer, pancreatitis and hypothyroidism. Infectious causes include cytomegalovirus and Epstein-Barr virus infections.Full Answer >
Elevated blood urea nitrogen and creatinine levels usually indicate the kidneys are not functioning as well as they should, explains Riverside Health System. The kidneys are responsible for removing BUN and creatinine from the bloodstream.Full Answer >