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.
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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  (University of Minnesota Health Maple Grove Clinics, Range, UMMC-West Bank, UMMC-East Bank, Oxboro Bloom, Lakes, Ridges, Northland, Southdale, Clinics, Grand Itasca, St. Joseph's, St. John's, Woodwinds)


Reference Range:

Newborn (0-2 d)

about 1.012

Infant (3 d – 5 mo)


6 mo and older




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