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Mayo Clinic Laboratories

Epic Code LAB107 Osmolality, Blood

Important Note

Collection difference between Corewell Health West (CHW) and Corewell Health South (CHS) 

Test Name Alias

Osmolality Serum | OSMO | 8286

Interface Order Alias

10213

Collection Instructions

Collection difference between Corewell Health West (CHW) and Corewell Health South (CHS)

 

Specimen Collection: Blood

Container(s): 

  • CHW: Mint Green Top (Lithium Heparin Gel) or Gold Top (Serum Separator-SST Gel) 
  • CHS: Gold Top (Serum Separator-SST Gel) or Red Top (Plain, No additive) 

Preferred Volume to Collect: Full tube

Minimum Volume to Collect: 2.0 mL

 

Collection Instructions:

  • Mint Green tube: Gently invert 8 – 10 times to mix lithium heparin anticoagulant with blood.
  • Gold tube: Gently invert 8 –  10 times to mix clot activator with blood.
  • Specimen should be processed within 2 hours, see processing instructions

 

Processing Instructions (Laboratory, Outpatient or Off-site collection)

  • Processed Specimen: Plasma or Serum
  • Centrifuge/Spin: Yes
  • Aliquot: Yes
  • Minimum volume plasma/serum:1.0 mL
  • Processing Instructions:
    • Plasma: Centrifuge after collection. Do not collect Mint Green 
    • Serum: Allow blood to clot for 30 minutes in a vertical position and centrifuge within 2 hours.
  • Transport Temperature: Refrigerated

Specimen Transport Temperature

Refrigerated

Specimen Stability

Ambient: 12 hours

Refrigerate: 72 hours

Frozen: aliquot plasma/serum for longer storage

Laboratory Retention: 72 hours

Test Frequency

Available 24 hours, usual TAT 1 day.

Reference Range

270 – 300 mOsm/kg H2O

Performing Department

Chemistry

Performing Department Laboratory Location

CHW

Corewell Health Reference Laboratory, Grand Rapids, MI
Corewell Health Blodgett Laboratory, Grand Rapids, MI

 

CHS
Corewell Health Lakeland St. Joseph Laboratory, St. Joseph, MI

Methodology

Freezing Point Depression

CPT

83930

CDM Code

3018393001

Epic Test ID

1230101000

LOINC

Osmolality: 2692-2

Mayo Access Code

SHO8286

Reviewed Date

3/7/2024

Updated Date

5/23/2025 - CHS info added