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HelpTest Code LAB137 T3 (Triiodothyronine), Free
Methodology
Cobas ECLIA electrochemiluminescence
Literature References:
Package Insert: Free Triiodothyronine, FT3III. Roche Corporation 03/2021.
Performing Laboratory
Barnes-Jewish Hospital Laboratory
Specimen Requirements
Specimen Type: Plasma
Container/Tube: mint green-top (lithium heparin) tube
Specimen Volume: Full tube
Pediatric collection volume: 3.0 mL - minimum 2.0 mL
Specimen Transport Temperature
Ambient
Reference Values
2.0-4.4 pg/mL
Literature Reference:
Package Insert: Free Triiodothyronine, FT3III. Roche Corporation 03/2021.
Day(s) Test Set Up
Monday through Sunday
Turnaround Time:
STAT: not available
Routine: 2-4 hours of receipt
Test Classification and CPT Coding
84481
Additional Information
For BJH Laboratory Use Only
Alternate Tube(s):
1 Dark-green top (lithium heparin)
1 plain, red-top tube
Separator gel tube is acceptable
Analyte Stability:
See Analyte Stability Chart.
Laboratory Processing Instructions:
Test performed in BJH Core Lab. Processed by automated line for delivery to the Cobas 8000. Completed specimens are stored refrigerated for 5 days.
Test performed in Ambulatory Cancer Building Lab. Centrifuge sample and deliver to the Cobas. Completed specimens are stored refrigerated for 5 days.
LOINC Code Information
| Name | LOINC Code |
| T3, Free, Plasma | 3051-0 |