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Sodium

Tube Type = Mint Green Top

Tube Type

Test ID   LAB122
EPIC Order
   SODIUM
CPT Code(s)   84295
Group/Individual Test   Individual
Laboratory   Core Laboratory
Tube Station   Routine 30; STAT 888
Specimen Routine: 1 mL blood/green lithium heparin gel tube. Also acceptable gold SST or red plain tube.
  Micro: 200 µL blood/mint green top bullet/gold top/red top
Stability
Unspun: 6 hours
Spun/separated, Room Temperature: 8 hours
Spun/separated, Refrigerator: 7 days
Spun/separated, Frozen: 30 days
Availability 24hrs/day
Turnaround Time   STAT 1 hr., Routine 2 hrs.
Reference Range Normal: 135-145 mmol/L
  Critical: <120 or >155 mmol/L

Reviewed by J. Carr on January 02, 2026

UNC Hospitals
McLendon Clinical Laboratories
101 Manning Drive
Chapel Hill, NC 27514