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    Urine specific gravity test

    Urine density

    Urine specific gravity is a laboratory test that measures the concentration of all chemical particles in the urine.

    How the Test is Performed

    After you provide a urine sample, it is tested right away. The health care provider uses a dipstick made with a color-sensitive pad. The color the dipstick changes to will tell the provider the specific gravity of your urine. The dipstick test gives only a rough result. For a more accurate result, your health care provider may send your urine sample to a lab.

    How to Prepare for the Test

    Your health care provider will ask you to temporarily stop any medicines that may affect the test results. These may include dextran and sucrose. Be sure to tell your provider about all the medicines you take. Do not stop taking any medicine before talking to your provider.

    Also tell your provider if you recently received intravenous dye (contrast medium) for an x-ray. The dye can also affect test results

    How the Test Will Feel

    The test involves only normal urination. There is no discomfort.

    Why the Test is Performed

    This test helps evaluate your body's water balance and urine concentration.

    Normal Results

    This test helps check your body's water balance and urine concentration.

    Osmolality is a more specific test for urine concentration. The specific gravity test is easier and more convenient, and is usually part of a routine urinalysis. As such, the osmolality test may not be needed.

    What Abnormal Results Mean

    Increased urine specific gravity may be due to different conditions such as:

    • Diarrhea that causes dehydration
    • Heart failure
    • Loss of body fluids (dehydration)
    • Narrowing of the kidney artery (renal artery stenosis)
    • Sugar, or glucose, in the urine
    • Syndrome of inappropriate antidiuretic hormone secretion (SIADH)

    Decreased urine specific gravity may be due to:

    • Damage to kidney tubule cells (renal tubular necrosis)
    • Diabetes insipidus
    • Drinking too much fluid
    • Kidney failure
    • Severe kidney infection (pyelonephritis)

    Risks

    There are no risks with this test.

    References

    Gerber GS, Brendler CB. Evaluation of the urologic patient: history, physical examination, and urinalysis. In: Wein AJ, Kavoussi LR, Novick AC, et al., eds. Campbell-Walsh Urology. 10th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 3.

    McPherson RA, Ben-Ezra J. Basic examination of urine. In: McPherson RA, Pincus MR, eds. Henry’s Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 28.

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          Tests for Urine specific gravity test

          Review Date: 8/18/2013

          Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.

          The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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