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Test Code LAB137 T3 (Triiodothyronine), Free

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Cobas ECLIA electrochemiluminescence

Literature References:

Package Insert: Free Triiodothyronine, FT3III. Roche Corporation 03/2021.

Specimen Requirements

Specimen Type: Plasma
Container/Tube: mint green-top (lithium heparin) tube
Specimen Volume: Full tube

 

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

Reference Values

2.0-4.4 pg/mL

Literature Reference:

Package Insert: Free Triiodothyronine, FT3III. Roche Corporation 03/2021.

Specimen Transport Temperature

Ambient

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