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Patient education: Urine osmolality test (The Basics)

Patient education: Urine osmolality test (The Basics)

What is a urine osmolality test? — 

This is a test to measure the total concentration of all dissolved particles in the urine like sodium (salt), glucose (sugar), and urea.

Why might I get a urine osmolality test? — 

Your doctor might order this test if you have 1 or more of these problems:

●You are urinating much more than normal, including at night, and are very thirsty.

●Your blood sodium level is too high or too low.

The urine osmolality test can sometimes help your doctor figure out the cause of these problems.

How do I prepare for a urine osmolality test? — 

Your doctor or nurse will tell you what you need to do. Most of the time, you do not need to do anything special to prepare. Ask questions there is anything you do not understand.

What happens during a urine osmolality test? — 

Your doctor or nurse will give you a clean plastic cup to collect your urine. To do this:

●Wash your hands with soap and water.

●Hold the cup so it is ready to catch your urine.

●Start urinating, and catch the urine in the cup. Fill the cup with as much urine as your doctor or nurse told you to collect.

●Finish urinating in the toilet.

●Give the urine sample to your doctor, nurse, or the lab personnel.

What do my results mean? — 

Your doctor or nurse will tell you when to expect your results, and will contact you with the results. Or if you use an online "patient portal," you might get an alert there when your results are ready.

Your doctor will use the information from the test to learn more about your condition. They will talk to you about what to do next.

This topic retrieved from UpToDate on: May 11, 2025.
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