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HelpTest Code LAB4939 Specific Gravity, Random, Urine
Additional Codes
| Test Name in EPIC | EPIC Test Code | Mnemonic |
|---|---|---|
| SPECIFIC GRAV, UR | LAB4939 | USPGI |
Useful For/Utility
A partial assessment of the kidney's ability to concentrate urine.
Methodology
IRIS or MULTISTIX
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.
Specimen Requirements
Specimen Type: Urine, random
Container/Tube: Plastic urine container
Specimen Volume: 5-10 mL
Specimen Minimum Volume: 3.5 mL
Collection Instructions:
1. No preservative.
2. Cotton ball collections—cotton ball placed in child’s diaper—are acceptable for pediatric patients only.
Specimen Transport Temperature
Refrigerate 5 days/Frozen OK/Ambient NO
Day(s) Test Set Up
Monday through Sunday
Performing Laboratory
Urinalysis-
Brainerd Lakes: Convenient Care – Baxter, Hackensack Clinic Lab, Lakes Area Urology, St. Joseph's - Baxter Clinic Lab, St. Joseph's - Brainerd Clinic Lab, St. Joseph's - Crosslake Clinic Lab, St. Joseph's - Emily Clinic Lab, St. Joseph's - Pequot Lakes Clinic Lab, St. Joseph's - Pierz Clinic Lab, St. Joseph's - Pillager Clinic Lab, St. Joseph's - Pine River Clinic Lab, St. Joseph's Medical Center Lab
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Test Classification and CPT Coding
81003
Reference Values
1.003-1.035