Urine urea nitrogen is a test that measures the amount of urea in the urine. Urea is a waste product resulting from the breakdown of protein in the body.
How the Test is Performed
A 24-hour urine sample is often needed. You will need to collect your urine over 24 hours. Your health care provider will tell you how to do this. Follow instructions exactly to ensure accurate results.
How to Prepare for the Test
No special preparation is needed.
How the Test will Feel
The test involves only normal urination. There is no discomfort.
Why the Test is Performed
This test is mainly used to check a person’s protein balance and the amount of food protein needed by severely ill people. It is also used to determine how much protein a person takes in.
Urea is excreted by the kidneys. The test measures the amount of urea the kidneys excrete. The result can show how well the kidneys are working.
What Abnormal Results Mean
Low levels usually indicate:
- Kidney problems
- Malnutrition (inadequate protein in diet)
High levels usually indicate:
- Increased protein breakdown in the body
- Too much protein intake