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Clear
 
Test Code:
090-10-0620-01

Order Name:
Specific Gravity

 
Useful For:
As a partial assessment of the kidney’s ability to concentrate urine
 
Methodology:
Refractometer
 
 
 
Test Code:
090-10-0620-01

Order Name:
Specific Gravity

 
Collection Specimen Or Container:
Urine/ Clean container 20 mL
 
Specimen Testing Type:
Urine, minimum volume 2 mL
 
Sub Mission Container:
Clean container
 
Specimen Stabillity:
Specimen Type Temperature Time
Random urine Room temperature, 18oC to 25oC 2 hours
  Refrigerated, 2oC to 8oC 24 hours
 
 
 
Test Code:
090-10-0620-01

Order Name:
Specific Gravity

 
Method detail:
Refractometer
 
Schedule:
Tested Daily (24 hours)
 
Turnaround Time:
Collected specimen to report within 1 hour
 
Performing Location:
Hematology, Laboratory Department Tel. 17254
 
Specimen Retention Time:
3 days
 
 
 
Test Code:
090-10-0620-01

Order Name:
Specific Gravity

 
 
Clinical Information:
Specific gravity (SG), the ratio of the mass of a solution compared to the mass of an equal volume of water, is an estimate of the concentration of substances dissolved in the solution.

Urine SG can be used to assess the kidney’s ability to concentrate or dilute urine. However, because protein, glucose, and contrast dye have molecular masses that are relatively large compared to other major components of urine (eg, sodium, chloride, potassium), they disproportionately affect SG. In these cases, urine osmolality is a better measure of urine concentration.
 
Reference Value:
1.000 - 1.035
 
Interpretation:
Low specific gravity (SG) (1.001-1.003) may indicate the presence of diabetes insipidus, a disease caused by impaired functioning of antidiuretic hormone (ADH). Low SG also may occur in patients with glomerulonephritis, pyelonephritis, and other renal abnormalities. In these cases the kidney has lost its ability to concentrate due to tubular damage.

High SG may occur in patients with adrenal insufficiency, hepatic disease, congestive heart failure, or in patients experiencing excessive water loss due to sweating, fever, vomiting, or diarrhea.
 
Clinical Reference:
http://www.mayomedicallaboratories.com (Retrieved: 22 Jan 2019)