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Calcium, Serum

Tube Type = Mint Green Plasma Separator Tube

Tube Type

Test ID LAB53
EPIC Order CALCIUM
CPT Code(s) 82310
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, orange SST or red plain tube
Micro: 200 µL blood/mint green top bullet/gold top/red top
Stability
 
 
 		 Unspun: ≤6 hrs
Spun/Separated,
Room Temp:		 ≤8 hours
Spun/Separated,
Refrigerated:		 ≤2 days
Frozen: 6 months
Availability 24 hrs/day
Turnaround Time STAT 1hr; Routine 2hrs
Reference Range Normal: Age Range mg/dL
0 - 7 days 7.4-11.4
>7 days 8.7-10.4
Critical:

<6 mg/dL or >14 mg/dL for 0-7 days

<6 mg/dL or >12 mg/dL for >7 days
Comments Reference ranges effective 7/13/2021

Reviewed by J. Carr on January 10, 2026

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