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Blood Urea Nitrogen

Kidneys are two brownish bean shaped organs located on each side of the spinal column. They are mainly responsible for filtering waste products, excess water, and other impurities out of the blood. They also control the pH, salt, and potassium levels in the body; produce hormones that manage red blood cell production, and regulate blood pressure.


Blood urea nitrogen (BUN) test is carried out to check the levels of nitrogen in the blood. The BUN test helps in determining kidney function.

Why is the test ordered?

A BUN test is prescribed to analyze the functioning of the kidneys. The test may be helpful in monitoring kidney disease and evaluating the condition of the patient undergoing treatment for a kidney disease.

How to prepare for the test?

It is better not to consume meat or protein rich food for up to 24 hours leading up to the test to have accurate results.

How is the sample collected?

A blood sample is collected from the vein in the arm of the individual using a needle.

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