Specific Gravity, Urine

Abbrev Code:USG   
Order Code:LAB3864Order Name:Specific Gravity Urine
Synonyms:Refractive Index, Urine
Methodology:Reagent strip
CPT Codes: 81003 x1
Turnaround Time:Performed and reported 24 hours/day.
Special Instructions:Urine is the only appropriate fluid for specific gravity. For other body fluids, alternatively order a total protein.
Associated Links:

Urine Collection Procedure

Collection Instructions

Specimen:Urine, random collection
Optimal Volume:Submit entire collection; analysis requires 0.5 mL
Container:Plastic leakproof container, sterile
Collection Instructions:Deliver to laboratory within 1 hour. Specimen of choice is first morning mid-stream clean catch urine. Refrigerate urine if it cannot be delivered immediately.
Causes for Rejection:Collected with preservative.

Processing and Shipping

Specimen Processing:Store in refrigertor. If sending, aliquot 1 mL and send within 2 hours room temperature; 24 hours refrigerated.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Urinalysis  (Clinics, CSC Maple Grove, Grand Itasca, Lakes, Northland, Oxboro Clinic, Range, Ridges, Southdale, St. John's, UMMC East Bank, UMMC West Bank, Woodwinds)


Reference Range:

Newborn (0-2 d)

about 1.012

Infant (3 d – 5 mo)


6 mo and older




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