Clinics and Departments

Laboratory Services

Lab Dept:

Chemistry

Test Name:

OSMOLALITY

General Information

Lab Order Codes:

OSM

Synonyms:

Osmo

CPT Codes:

83930 – Osmolality; blood

Test Includes:

Osmolality concentration reported in mOsm/kg.

Logistics

Test Indications:

Determination of osmolality can be useful in the assessment of electrolyte and acid/base disorders. Comparisons can determine the status of renal water regulation settings of severe electrolyte disturbances, as might occur in diabetes insipidus.

Lab Testing Sections:

Chemistry

Phone Numbers:

MIN Lab: 612-813-6280

STPLab: 651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

4 hours

Special Instructions:

N/A

Specimen

Specimen Type:

Blood

Container:

Green top (Li Heparin) tube preferred
Alternate tube: Red top (plain, no gel) tube

Draw Volume:

0.6 mL blood

Processed Volume:

0.2 mL plasma/serum

Special Processing:

Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into plastic sample cup. Run within 4 hours or store at refrigerated temperatures.

Patient Preparation:

None

Sample Rejection:

Mislabeled or unlabeled specimen

Interpretive

Reference Range:

275 - 295 mOsm/kg

Critical Values:

N/A

Limitations:

N/A

Methodology:

Freezing point depression

References:

Advanced Instruments Osmometer Model 2020 User’s Guide, 2025 Rev16, 081508, Two Technology Way, Norwood, MA 02062

Tietz Textbook of Clinical Chemistry and Molecular Diagnostics (2006) Elsevier Saunders Company, pp 991 - 994

Jacobs & DeMott Laboratory Test Handbook Lexi-Comp, Inc (2001) Hudson, OH, 5th Edition, pp 236-237



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