Specific Gravity
No Results
No Results
processing….
Urinary specific gravity (SG) is a measure of the concentration of solutes in the urine. It measures the ratio of urine density compared with water density and provides information on the kidney’s ability to concentrate urine. A urinary specific gravity measurement is a routine part of urinalysis. [1, 2, 3] The reference range is 1.005-1.030. [3]
Conditions associated with a high urine specific gravity include the following [1, 4] :
Volume loss (dehydration, vomiting, diarrhea, fever)
Shock
Syndrome of inappropriate antidiuretic hormone
Conditions associated with a low urine specific gravity include the following [1, 4] :
Renal failure
Pyelonephritis
Glomerulonephritis
Psychogenic polydipsia
Malignant hypertension
Specifics for collection and panels are as follows [1, 4] :
Specimen type: Urine
Container: Plastic urine specimen container
Collection method: Random urine sample
Specimen volume: 20 mL
Panels: Urinalysis
Other instructions: Keep specimen cool; high temperatures alter the result
Related tests: Urine osmolality
Urinary specific gravity is a measure of the concentration of solutes in the urine and provides information on the kidney’s ability to concentrate urine. Urine osmolality is a more specific test for urine concentration; however, urine specific gravity measurement is a routine part of urinalysis.
Indications for testing urine specific gravity include the following:
Complicated urinary tract infection (eg, pyelonephritis)
Hypernatremia
Hyponatremia
Polyuria
Considerations [4]
The following may increase urine specific gravity and should be discontinued before testing:
Dextran
Sucrose
Intravenous contrast dye
Daniels R. Delmar’s Guide to Laboratory and Diagnostic Tests. 2nd ed. Ashland, Oregon: Oregon Health and Science University; 2010.
McPherson RA, Pincus MR. Henry’s Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia: Elsevier Saunders; 2011.
Williamson MA, Snyder LM, eds. Wallach’s Interpretation of Diagnostic Tests. 9th ed. Philadelphia, Pa: Lippincott Williams & Wilkins; 2011.
Fischbach F. Manual of Laboratory & Diagnostic Tests. 7th ed. Philadelphia, Pa: Lippincott Williams & Wilkins; 2004.
Rugheed Ghadban, MD Assistant Professor, Division of Cardiovascular Medicine, University of Missouri-Columbia School of Medicine
Disclosure: Nothing to disclose.
Eric B Staros, MD Associate Professor of Pathology, St Louis University School of Medicine; Director of Clinical Laboratories, Director of Cytopathology, Department of Pathology, St Louis University Hospital
Eric B Staros, MD is a member of the following medical societies: American Medical Association, American Society for Clinical Pathology, College of American Pathologists, Association for Molecular Pathology
Disclosure: Nothing to disclose.
Judy Lin, MD
Disclosure: Nothing to disclose.
Specific Gravity
Research & References of Specific Gravity |A&C Accounting And Tax Services
Source