Urine specific gravity is a laboratory test that measures the concentration of all chemical particles in the urine.
The test requires a clean-catch urine sample. For information on how to collect this urine sample, see: Clean-catch urine culture
Your health care provider will instruct you, if necessary, to discontinue drugs that may interfere with the test. Drugs that can increase specific gravity measurements include dextran and sucrose. Receiving intravenous dye (contrast medium) for an x-ray exam up to 3 days before the test can also interfere with results.
Eat a normal, balanced diet for several days before the test.
The test involves only normal urination, and there is no discomfort.
This test helps evaluate your body's water balance and urine concentration.
Bazari H. Approach to the patient with renal disease. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 115.
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