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Test Code LAB107 Osmolality, Blood

Important Note

CHNE/NW - Centrifuge specimen, pour off into separate container and place pour off in freezer. Specimens are stable 6 Hr Ambient, 24 Hr Refrigerated, and 3 months frozen (poured off). 

Methodology

Freezing Point Depression

Literature Reference:

User’s guide: Advanced Micro-Osmometer model A2O. Advanced Instruments, Inc.

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Specimen Requirements

Specimen Type: Plasma
Container/Tube: Mint-green top (lithium heparin)
Specimen Volume: Full tube

 

Specimen Transport Temperature

Ambient

Reference Values

275-300 mOsmo/kg H2O
Critical result (automatic call-back): ≤260 mOsmo/kg H2O or ≥330 mOsmo/kg H2O

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.

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

83930

Additional Information

For BJH Laboratory Use Only

Alternate Tube:

1 dark green-top (lithium heparin) tube
1 red-top tube

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days.

Special Instructions

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Osmolality, Blood 2692-2