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Blood Urea Nitrogen BUN Test

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Blood Urea Test Overview

Protein in body are broken down and stored as ammonia and nitrogen in the liver, which is then converted to urea. Urea is carried from the liver to the kidneys via the blood stream. The kidney then gets rid of the urea through urine. The blood urea nitrogen (BUN) test indicates the amount of urea in the blood.


The BUN test measures the amount of urea nitrogen present in your blood. Urea nitrogen (UreaN) is a waste product. It is created when your body breaks down proteins. Too much urea nitrogen can indicate kidney problems. It may also indicate a diet too high in protein.

BUN (Blood Urea Nitrogen) is used to assess the health of the liver and kidneys. The results guide healthcare professionals on how to treat patients.

What is the BUN Urea Nitrogen Serum test?

The BUN (blood urea nitrogen) test is also known as a blood urea nitrogen test or BUN test. It determines the amount of urea nitrogen in the blood. Urea nitrogen is a waste product that the liver makes and the kidneys get rid of. The BUN test is used to help diagnose and monitor kidney function and detect kidney damage or disease.

The test is performed by drawing a small blood sample from the arm and sending it to a lab to be analyzed. The test measures the amount of urea nitrogen in the blood to determine how the kidneys work. Many things, including dehydration, kidney problems, and some medical conditions such as congestive heart failure and urinary tract infections, can cause an increased BUN level.

What does a BUN Urea Nitrogen Serum test do?

A BUN (urea-nitrogen) serum test is used to:

• Determine how well the kidneys are functioning

• Monitor how well treatment for kidney diseases is working

• Measure if dehydration or overhydration is affecting kidney function

• Identify anaemia and its causes

• Examine if there is any indication of a dietary protein overload

Who should do the BUN Urea Nitrogen Serum test?

This test measures the quantity of urea nitrogen in the bloodstream. It also indicates kidney function. Who should take this test?

  • Individuals who have known or suspected renal disease

  • People suffering from severe renal failure

  • Individuals both before and after an organ transplant

  • Dialysis patients on a long-term basis

  • People having a history of renal illness in their family

  • Anyone suffering from weariness, weakness, disorientation, or decreased productivity

Doctors often suggest performing this test for people who display symptoms like:

• High blood pressure

• Diabetes

• Kidney disease

• Liver disease

• Certain kinds of toxicity or poisoning

• Various kinds of heart disease

• Hypercholesterolemia or elevated cholesterol levels

• Gout

Written by: Dr. Shibani R, Medical Writer, Medical Affairs

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Blood Urea Nitrogen BUN Test Price

Metropolis Healthcare is a leading diagnostics centre and pathology lab in India equipped with the latest state-of-the-art technologies that provides the Blood Urea Nitrogen BUN Test with a clear pricing structure.

The Blood Urea Nitrogen BUN Test Price in Mumbai is ₹ 240 .

We are committed to deliver accurate and quality results from the best labs in India with complete transparency regarding test cost and turnaround time. No matter where you are, we strive to offer patients high-quality service that is affordable and accessible.

Frequently Asked Questions

BUN is tested to check kidney function for diagnosis of kidney disease and to assess progression of disease. This tests is often ordered along with serum creatinine.
It may also be done as part of complete metabolic panel to diagnose metabolic disorders.

Blood urea test measures the concentration of urea and nitrogen in the blood.

A: The BUN Urea Nitrogen Serum test measures urea nitrogen levels in the blood. Urea nitrogen is produced by the body to break down proteins. It comprises two compounds: urea and nitrogen.

The blood sample is taken from a vein in your arm, using a small needle. After the needle is inserted, a small amount of blood will be collected into a test tube or vial. You may feel a  little sting when the needle goes in or out. This usually takes less than five minutes.

High BUN levels may be due to renal and pre-renal causes. 
Pre-renal causes include congestive heart failure, severe dehydration, burns, shock, GI bleeding, high protein diet or due to certain medications. 
Renal causes include glomerulonephritis, polycystic kidney disease, obstructive uropathies
Low BUN levels may at times occur due to liver diseases, malnutrition or lack of protein in the diet.

Suppose the results of the BUN Urea Nitrogen Serum test are present. In that case, it indicates that the nitrogen levels in the blood are elevated. This may be caused by kidney, liver, or metabolic problems. If the results are absent, it indicates that the nutrients normally present in the blood are not being adequately absorbed

 Patients do not need to take any special preparation for the BUN Urea Nitrogen Serum test. It is usually performed as part of a routine medical checkup. However, it is advised that patients do not drink alcohol for 24 hours before the test nor have any meal for six to eight hours.

Normal BUN Urea Nitrogen Serum levels are typically in the range of 8 to 25 mmol/l.

The BUN Urea Nitrogen Serum test is a test. It measures the amount of nitrogen present in the blood. It helps to evaluate the condition of the liver, kidney, and other organs and diagnose issues related to nutrition and metabolism.

Several other tests are often ordered as part of a comprehensive medical evaluation.

Blood tests:

Creatinine: The creatinine test measures the levels of a certain protein in your blood produced by muscle tissue. It’s used to evaluate kidney function. It also helps detect kidney problems.

Electrolytes: This test detects balance levels of key minerals in the body, like sodium, potassium, chloride, and bicarbonate. Electrolytes are essential for proper health. They are regulated by the kidneys.

Uric Acid: This test measures the amount of uric acid in the blood. High uric acid levels can indicate kidney or liver problems or gout.

Urine tests:

Urinalysis: This important exam helps detect changes in urine colour and blood, proteins, and other components of urine.

Urine Protein: This test looks for the presence of protein in the urine. This can be an indicator of kidney damage.

Urinary Creatinine: This test calculates the glomerular filtration rate (GFR). It measures how well the kidneys filter waste from the blood.


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