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Test Code OSMO Osmolality

EHR Test Codes

  Test Code Test Name
Atlas OSMO Osmolality, Serum
Cerner   Osmolality

Specimen Requirements

Preparation of Patient: 

None

 

Container Type: 

Green Top 5mL Lithium Heparin Separator Tube

Or

 

Gold Top 6mL SST Gel & Clot Activator Tube

Specimen Type:

Plasma or Serum

 

Specimen Volume: 

2.5 mL Plasma or Serum minimum .6 mL

 

Specimen Handling/Transport:

Separate plasma or serum from cells within 2 hours of collection.

Transport ambient room temperature or refrigerated.

 

Specimen Stability/Storage:

2 days ambient room temperature

2 days refrigerated 2-8°C

 

Specimen Rejection:

Frozen samples

Performing Laboratory

Munson Medical Center Laboratories

Chemistry Department

Priority, Frequency, & Turnaround

Priority:

Non-Emergent

 

Frequency:

24 hours 7 days a week

 

Turnaround:

0 - 1 days

Methodology

Freezing Point Depression

Reporting

Reference Range:

275 - 295 mOsm/kg H2O

 

Critical Decision: 

None

Clinical Significance

Osmolality is used in assessing the concentrating ability of the kidney.  In normal individuals on an average intake, the ratio of urine osmolality to serum osmolality is between 1.0 and 3.0.  In patients with renal tubular deficiency the ratio will be below that observed in normal individuals.  In polyuria of diabetes insipidus, the ratio will be between 0.2 and 0.7.  It is also used to evaluate mannitol treatment for head injury patients.  Mannitol will help regulate intracranial pressure.

CPT Code(s)

83930

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