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HelpTest Code LAB420 Osmolality, Urine, Random
Performing Laboratory
Barnes-Jewish Hospital Laboratory
Methodology
Freezing Point Depression
Literature Reference:
User’s guide: Advanced Micro-Osmometer model A2O. Advanced Instruments, Inc.
Specimen Requirements
Specimen Type: Urine, random
Container/Tube: Urine Complete Cup Kit-Specimen collected in a container with either an acid or base is not acceptable.
Specimen Volume: 10 mL
Collection Instructions: No additive.
Additional Information: See Urine Collection information under General Information
Day(s) Test Set Up
Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory
Test Classification and CPT Coding
83935
Reference Values
Highly variable depending on patient condition and electrolyte intake.
Literature Reference:
Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6 th ed: Chapter 35, p. 604, Elsevier, St. Louis, MO 2018.
Specimen Transport Temperature
Ambient
Additional Information
For BJH Laboratory Use Only
Laboratory Processing Instructions:
Test performed in BJH Core Lab. Mix urine well. Record volume, period, and pH on request form. Using 13x100 test tube, prepare a 7-mL tube for processing by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days.
Special Instructions
See Urine Collection information under General Information.
See Analyte Stability Chart under General Information for a complete list.
LOINC Code Information
| Name | LOINC Code |
| Osmolality, Urine, Random | 57372-5 |