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Test Code 1252 Osmolality, Blood

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


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

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

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

Alternate Tube:

1 dark green-top (lithium heparin) tube
1 red-top tube
Analyte Stability:

See Analyte Stability Chart in Special Instructions.

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.

Specimen Transport Temperature


Special Instructions

LOINC Code Information

Name LOINC Code
Osmolality, Blood 2692-2