Urine concentration test
Alternate Names : Water loading test, Water deprivation test
Normal Values
In general, normal values are as follows: - 1.0002 to 1.030 (normal specific gravity)
- 1.001 after drinking excessive amounts of water
- More than 1.030 after avoiding fluids
- Concentrated after receiving ADH
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
What do Abnormal Results Mean?
Increased urine concentration may indicate: - Dehydration
- Diarrhea that leads to dehydration
- Excessive sweating that leads to dehydration
- Glycosuria
- Heart failure (related to decreased blood flow to the kidneys)
- Renal arterial stenosis
- Syndrome of inappropriate antidiuretic hormone secretion (SIADH)
- Vomiting
- Water restriction
Decreased urine concentration may indicate: - Excessive fluid intake
- Diabetes insipidus
- Renal failure (loss of ability to reabsorb water)
- Pyelonephritis
Additional conditions under which the test may be performed: - Complicated UTI (pyelonephritis)
- Nephrogenic diabetes insipidus
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