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You are here : 3-RX.com > Medical Encyclopedia > Tests and Exams > Urine Osmolality Test

Urine Osmolality Test

Alternate Names : Urine Osmolality

Overview & Description | Preparation & Expectations | Results and Values

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:

  • start urinating into the toilet
  • move the container to catch a sample of urine
  • take away the container and finish urinating into the toilet
  • The container should be covered and brought to the healthcare provider or lab for testing.


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    Urine Osmolality Test: Preparation & Expectations

    Author: David T. Moran, MD
    Reviewer: Eileen McLaughlin, RN, BSN
    Date Reviewed: 09/20/01

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