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Test Code 0170 Osmolality, Urine, Random

Performing Laboratory

Barnes-Jewish Hospital Laboratory


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 in Special Instructions for additional 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

Reference Values

Highly variable depending on patient condition and electrolyte intake.


Literature Reference:

Tietz textbook of Clinical Chemistry and Molecular Diagnostics 5th ed.  Philadelphia, Elsevier, 2012, 807-849.

Test Classification and CPT Coding


Additional Information

For BJH Laboratory Use Only

Analyte Stability:

See Analyte Stability Chart in Special Instructions.

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.

Specimen Transport Temperature


LOINC Code Information

Name LOINC Code
Osmolality, Urine, Random 57372-5