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HelpEpic 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