Magnesium

Tube Type = Mint Green Top

Tube Type

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Test ID LAB103
EPIC Order MAGNESIUM LEVEL
CPT Code(s) 83735
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 Top Tube
Micro: 200 µL blood/mint green top bullet/gold top/red top.
Stability



 Unspun:
6 hours
Spun/Separated,
Room Temp:
2 hours
Spun/Separated,
Refrigerated:
7 days
Spun/Separated,
Frozen:
12 months
Availability 24 hrs/day
Turnaround Time STAT 1 hour, Routine 2 hours
Reference Range Normal: 1.6-2.6 mg/dL
Critical: <1.0 or >5.0 mg/dL

Reviewed by J. Carr on December 31, 2025

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