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Also known as: Blood urea nitrogen; BUN
Formal name: Urea
Related tests: Creatinine

At a Glance

Why Get Tested?

To evaluate kidney function and monitor the effectiveness of dialysis

When to Get Tested?

If you have non-specific symptoms that may indicate a kidney problem

Sample Required?

A blood sample drawn from a vein in the arm

The Test Sample

What is being tested?

Urea is produced when protein is broken down by the body. Healthy kidneys eliminate more than 90% of the urea the body produces, so blood levels indicate how well your kidneys are working.

How is the sample collected for testing?

A blood sample is drawn from a vein in the arm.

Is any test preparation needed to ensure the quality of the sample?

No test preparation is needed.

The Test

Common Questions

Ask a Laboratory Scientist

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.