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HelpEpic Test Code LAB107 Osmolality: Serum
Performing Location(s)
BMC
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
1.0 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”
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
Reference Values
| Population | Units | Reference Range | High Critical Value | Low Critical Value |
| All Populations | mOsm/kg | 270-300 | > 320 | < 265 |
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
Freezing Point Depression
CPT Code
83930
Last Updated
30-Mar-19