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Test Code BF37 Specific Gravity, Urine

Clinical Information

Specific gravity is defined as the ratio of the mass of the urine to the mass of an equal volume of water, and is an indicator of the kidneys' ability to concentrate or dilute the urine. 

Synonym

  • USG

Specimen Required

Preferred Container/Tube: Urine Container
Acceptable Container/Tube: Urine Container
Specimen Volume: 8 mL
Specimen Minimum Volume: 5 mL

Specimen Stability Information

Ambient: 
         Non-preservative tubes: 2 hours
         Preservative tubes: 72 hours
         NOTE: Preservative specimens are accepted but are not recommended.
Refrigerated: 8 hours

Rejected Due To

  • Unlabeled specimens
  • Ambient specimens >2 hours old
  • Specimens with fecal or vaginal contamination
  • Use of boric acid urine preservative
  • Specimens in collection cups

Reference Values

1.001-1.035

Method Description

Clinical Lab UH: Fiber optic refractive index method.
Clinical Lab University East: Fiber optic refractive index method.
Clinical Lab James: Fiber optic refractive index method.

 

All Performing Labs: pKa change of pretreated polyelectrolyte in relation to ionic concentration.

Performing Lab

Clinical Lab UH
Clinical Lab University East
Clinical Lab James
Clinical Lab Martha Morehouse
Clinical Lab Spielman
Clinical Lab West Campus

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Reporting Name

Specific Gravity, Urine

CPT Code Information

81003

LOINC Code Information

2965-2