In This Section

Available Tests

  • Thyroxine T4 (Total)

Thyroxine T4 (Total)

Tube Type

Test ID LAB126
EPIC Order
CPT Code(s) 84436
Group/Individual Test Individual
Laboratory Core Laboratory
Tube Station 30
Specimen Routine: 4 mL blood/serum separator tube/gold top/red top acceptable; see Comments
Micro: 0.9 mL blood/gold or red top bullet
Unspun: 8 hours
Spun/separated, Room Temp-<8 hrs recommended
Spun/separated, Refrigerator: 5 days
Spun/separated, Frozen: 4 weeks
Availability Routine: 24 hrs/day
Turnaround Time 2 hrs
Reference Range 1 wk-1yr: 7.2 - 15 µg/dL
1 yr+: 5.5 - 11.0 µg/dL

Please do not order in addition to Free T4.

Reference Range effective 2-26-2001.
Testing is performed using OrthoClinical Diagnostics TT4 Immunoassay.  Heterophilic antibodies may cause interference.

Reviewed by jlcarr on December 16, 2019

Note: Reference ranges provided on this web site are for guidance only, and may not reflect the most recent changes. Refer to laboratory reports for current reference data.

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