Triiodothyronine T3 (Total)

Tube Type = Mint Green Top

Tube Type

Test ID   LAB136
EPIC Order
   T3, TOTAL
CPT Code(s)   84480
Group/Individual Test   Individual
Laboratory   Core Laboratory
Tube Station   30
Specimen Routine: 4 mL blood/gold SST tube. Also acceptable orange or red plain tube
  Micro: 2 micro collection devices/900 µL blood gold top/ red top/ or orange top
Stability
Unspun: 8 hours
Spun/separated, Room Temp-<8 hrs recommended
Spun/separated, Refrigerator: 48 hours
Spun/separated, Frozen: 30 days
Availability Routine: 24 hrs/day
Turnaround Time   2 hours
Reference Range Normal:
Patient Age Total T3 Reference Range, ng/dL
1-23 months 120.0 - 240.0
23 months - 12 years 110.0 - 210.0
12 years - 20 years 90.0 - 190.0
20 years + 60.0 - 180.0
Comments

Testing is performed using the Siemens Atellica T3 Assay.  Heterophilic antibodies may cause interference.

Light green lithium heparin plasma is not an acceptable specimen type.

Reviewed by J. Carr on January 02, 2026

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