Contact Us

Popular Cities
  • NCR
  • BANG
  • HYD
  • CHEN
  • PUNE

Blood Urea Nitrogen (BUN)

Blood Urea Nitrogen (BUN)


Blood urea nitrogen ( BUN ) is a medical test that measures the amount of urea nitrogen found in blood. Urea is a waste product formed in the liver when protein is metabolized into its component parts (amino acids). This process produces ammonia, which is then converted into the less toxic waste product urea. Blood urea nitrogen or BUN test measures the amount of urea nitrogen in the blood.


Inform your doctor if you are on any medications, have any allergies or underlying medical conditions before your BUN. Your doctor will give specific instructions depending on your condition on how to prepare for BUN.

No specific preparation is required for this test. However, if it is performed along with other blood tests, you may need to fast (not eat or drink) for several hours.

Report delivery time

1-2 day

Result explanation

If the test result falls in the normal reference range generally no medical intervention is necessary. The BUN levels may be normal even when if one kidney is damaged and the other is functional.

High levels of blood urea nitrogen (BUN) indicate that your kidneys are not working properly. Symptoms of kidney damage are fatigue, bloody, coffee-colored or foamy urine, frequent urination, swelling on face, arms, stomach, legs, feet or around eyes, nausea or vomiting, weakness, muscle cramps etc. Other causes of high BUN levels are conditions that result in poor blood flow to the kidneys such as heart failure, gastrointestinal bleeding, shock, severe burns, or stress and urinary tract obstruction. Use of certain medications like antibiotics, dehydration and a high protein diet may also result in high BUN levels in the blood.

Low levels of blood urea nitrogen (BUN) are not very common. This can be due to liver disease or damage, malnutrition, overhydration or lack of protein in the diet. But these conditions are not diagnosed by this test. Women who are on the second or third trimester of pregnancy may also show low BUN levels.

If you have higher or lower than normal levels of BUN test results consult your doctor for further instructions. Based on the test results, your doctor may advise appropriate medical treatments, lifestyle modifications, or further diagnostic tests.

Gender Age groups Value

OTHER < 18 years 7 - 20 mg/dl

OTHER > 18 years 5 - 18 mg/dl

Global facts

The earliest known written record that likely referred to diabetes was in 1,500 B.C in the Egyptian Ebers papyrus. It referred to the symptoms of frequent urination.Diabetes symptoms such as thirst, weight loss, and excess urination were recognized for more than 1,200 years before the disease was named.