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Epic Test Code LAB21777 Osmolality: Calculated 

Performing Location(s)

BMC,CRH,LFH,HRK,OCH,FTT,FOX,FCC

Specimen Type

Serum or Plasma

Preferred Container

Gold or Red top tube

Alternate Container

Green top tube

Blood Tube Draw Volume

Min 50% draw volume  

Minimum Volume to Submit for Testing

1 mL Serum or Plasma

  • Multiple test can be performed from this volume. For question please contact the lab at 547-3975.  

Storage Requirements

Sample tubes should be centrifuged within 2 hour of collection followed by transfer of the serum (red or gold top) or plasma (green top) to a labeled plastic, aliquot tube.
See Causes of Rejection for temperature requirements.

Transportation Needs

Deliver specimen to the laboratory within 1 hour of collection. If not possible see “Storage Requirements”

Reference Values

Population Units Reference Range
All Populations (none) 270-300

 

Causes for Rejection

Mislabeled or unlabeled specimen
Less than 50% draw for Vacutainer tubes

Plasma > 24 hours room temperature

No Add-ons to unopened serum > 24 hours refrigerated

No Add-ons to opened serum > 12 hours refrigerated

Additional Information

Testing should occur as soon as possible and not > 24 hours after receipt at MIB

Can NOT add-on osmolality after aliquot has been opened and re-capped after 12 hours due to sensitivity to evaporation.

Days of Analysis

All

Available STAT

Yes

Methodology

Calculated from Sodium, Glucose, and Urea Nitrogen.

 

OSMOCALC = (Sodium * 2) + (Urea Nitrogen/2.8) + (Glucose/18)

CPT Code

Sodium: 84295

Glucose: 82947

Urea Nitrogen: 84520

 

The three components will be performed and billed.  There is no charge for the calculation.

Last Updated

22-July-19