Blood Urea Nitrogen BUN Test

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.

Reference

https://medlineplus.gov/lab-tests/bun-blood-urea-nitrogen/#:~:text=The%20BUN%20test%20measures%20the,may%20not%20have%20any%20symptoms.

Blood Urea Nitrogen

• BUN