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What is this test?

The 24-hour urine urea nitrogen test measures the amount of urea nitrogen excreted in your urine over a 24-hour period. Urea nitrogen is a waste product formed in the liver when protein is broken down. The kidneys normally filter urea from the blood and excrete it in urine. This test helps doctors understand how well your kidneys are removing this waste product and how your body is metabolizing protein.

How is the test performed?

You will receive a special collection container from your healthcare provider. On the day of the test, you will begin by urinating into the toilet (not the container) when you wake up. From that point on, for the next 24 hours, every time you urinate, you will collect the urine in the provided container. Keep the container refrigerated or in a cool place. At the end of 24 hours, you will urinate one final time into the container, then bring the complete collection to your lab or healthcare provider.

How to prepare for the test?

Before the test, inform your doctor about all medications you are taking, as some drugs can affect results. You should maintain your normal diet and activity level, as the test is meant to reflect your usual protein metabolism. Your doctor may ask you to avoid certain foods or supplements for a specific period before the test. It is important to drink adequate fluids unless otherwise instructed by your doctor.

Understanding your results

Normal urea nitrogen excretion varies based on factors such as age, sex, diet, and muscle mass. Generally, a higher than normal output may indicate high protein intake or increased protein breakdown in the body. Lower than normal output may suggest reduced kidney function, liver disease, or a low-protein diet. Your doctor will interpret your results in the context of your overall health and other test results.