Urine Osmolality - Urine Osmolality Test

A urine osmolality test measures the osmolality, or concentration of particles, in a person's urine. It provides information about the body's ability to balance fluids and other substances.

Who is a candidate for the test?

A urine osmolality test is done when fluid balance or kidney problems are suspected.

How is the test performed?

A mid-stream, or clean-catch, urine sample is required for this test. First, the entire area around the urethra should be washed off to prevent contamination of the sample. Then, a person should:

The container should be covered and brought to the healthcare provider or lab for testing.