Everything you need to know about BUN testing.

What is BUN?
When a protein in the liver is decomposed into its constituents, it produces waste products called urea. This is an ammonia production process that converts to less toxic products in the body called urea. This test measures blood nitrogen levels in urea. Urea is transported to the kidneys by the liver and repelled through the kidneys with urine. This process is stable, but low and stable amounts of urea nitrogen remain in the blood.

Most diseases and conditions that affect the function of the kidneys and the liver can alter blood urea nitrogen levels. If more amounts of urea are produced by the liver or if the kidneys do not function correctly, these values ​​increase in blood. If the injury or liver disease prevents the production of urea, these values ​​will decrease in the blood.

When is BUN tested?
Blood urea nitrogen (BUN) or BUN test with creatinine test to assess kidney function in a wide range of conditions from diagnosis of kidney disease to monitoring of patients with acute or chronic kidney failure. It may also be performed as part of individual public assessments. This test, along with creatinine testing, is also recommended in healthy people or those with kidney and liver disease in people at risk for kidney disease, such as diabetes or high blood pressure.

Signs of kidney disease:
When the doctor suspects signs of kidney disease, he will advise the person to have this symptom, such as:

Tiredness, decreased focus, decreased appetite or sleep problems
Influenza or puffiness, especially around the eyes or face, wrists, abdomen, thighs or ankles
Reduce the amount of urine or urine with blood, brown or oily
Urinary problems such as burning sensation or abnormal discharge during urination or changes in urination, especially at night
High blood pressure
Middle back pain in the subcutaneous region or near the kidneys
Review the results of the BUN test
The normal value in the adult trial is 23- 23 mg / dL. BUN elevation indicates renal dysfunction. This condition may be due to acute or chronic kidney disease, damage or failure. It may also be due to conditions that result from a lack of proper blood supply to the kidneys, such as congestive heart failure, shock, stress, recent heart attack, severe burns that are also due to obstruction of the urine or dehydration.

BUN concentrations may increase due to excessive protein degradation or increased intake of protein foods or gastrointestinal bleeding. Low levels of BUN are not so common and do not cause much concern. This may be due to severe liver disease, malnutrition or excessive fluid intake.

What should be observed before performing the BUN test?
A wide range of drugs can increase the amount of BUN.
Drugs that can lower BUN levels include chloramphenicol and streptomycin.
Both reduced and increased BUN levels may be seen during pregnancy.
The specimen will be taken from a blood sample and will not require special preparation.
You can simply use the membership in Trita and enter the user's area of ​​the smart doctor system, you will also be able to record the test in Trita and interpret the amount in your test without the need for a physician. Please check the blood tests section after you arrive.


  1. https://labtestsonline.org/tests/blood-urea-nitrogen-bun


Fatemeh Ghorbani

Fatemeh Ghorbani

فاطمه قربانی هستم، لیسانس ژنتیک، به علوم نوین پزشکی و ایمونولوژی علاقمندم. از شما دوست گرامی بخاطر مطالعه این مقاله و همچنین مجموعه تریتا بخاطر فرصت انتشار مطالبم در راستای کمک به ارتقای دانش کمال تشکر دارم. شاد باشید و سلامت

my name is Fatemeh Ghorbani, I have a B.S in genetics and interested in immunology and medical science. I believe that, even into the smallest acts, should be put our heart, mind and soul. Thank you for reading my article