Urine concentration test

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Female urinary tract

Male urinary tract

Urine concentration test

Water loading test; Water deprivation test

Normal values are indicated as follows (normal value ranges may vary slightly among different laboratories):

• 1.010 to 1.025 (normal specific gravity)
• 1.001 after water loading
• More than 1.025 after water deprivation
• Concentrated (increased specific gravity) after ADH administration

Increased urine specific gravity may indicate:

• Dehydration
• Diarrhea
• Excessive sweating
• Glucosuria
• Heart failure (related to decreased blood flow to the kidneys)
• Renal arterial stenosis
• Syndrome of inappropriate antidiuretic hormone secretion (SIADH)
• Vomiting
• Water restriction

• Excessive fluid intake
• Diabetes insipidus
• Renal failure (loss of ability to reabsorb water)
• Pyelonephritis

• Complicated UTI (pyelonephritis)
• Nephrogenic diabetes insipidus

Review Date: 02/03/2006
Reviewed By: Charles Silberberg, DO, Private Practice specializing in Nephrology, Affiliated with New York Medical College, Division of Nephrology, Valhalla, NY. Review provided by VeriMed Healthcare Network.