Urine specific gravity

Alternative Names: Urine density

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

See also:

• Urine concentration test
• Urine osmolality
• Urinalysis

Why is the Test Performed?

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

How is the Test Performed?

The test requires a clean-catch urine sample. For information on how to collect this urine sample, see: Clean-catch urine culture

Preparation for the Test

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.

How will the Test Feel?

The test involves only normal urination, and there is no discomfort.

Considerations

Osmolality is a more specific test for urine concentration. However, the specific gravity measurement is easier and more convenient and usually part of a routine urinalysis. It frequently makes the osmolality measurement unnecessary.

Normal Results for Urine specific gravity

Normal values are between 1.002 to 1.030.

The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

Increased urine specific gravity may be due to:

• Addison's disease (rare)
• Dehydration
• Diarrhea that causes dehydration
• Glucosuria
• Heart failure (related to decreased blood flow to the kidneys)
• Renal arterial stenosis
• Shock
• Syndrome of inappropriate antidiuretic hormone secretion (SIADH)

Decreased urine specific gravity may be due to:

• Aldosteronism (very rare)
• Excessive fluid intake
• Diabetes insipidus - central
• Diabetes insipidus - nephrogenic
• Kidney failure
• Renal tubular necrosis
• Severe kidney infection (pyelonephritis)

Additional conditions under which the test may be performed:

• Complicated UTI (pyelonephritis)
• High blood sodium level (hypernatremia)
• Low blood sodium level (hyponatremia)
• Excessive urination

Female urinary tract	Male urinary tract

Review Date: 8/21/2011
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, Medical Director, A.D.A.M., Inc.

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