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Labcorp Oklahoma, Inc.
Test Directory


T3 Free and Total

Order Name T3FR & TOT
Test Number: 2020150
Revision Date 06/04/2021
Test Name Methodology LOINC Code
Triiodothyronine (T3), Free
Chemiluminescence Assay 3051-0 
Triiodothyronine (T3), Total
Chemiluminescence Assay 3053-6 
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.5 mL) Serum Clot Activator SST Refrigerated
Alternate 1 1 mL (0.5 mL) Plasma Lithium Heparin PST (Light Green Top) Refrigerated
Instructions Specimen should be separated from cells/gel if testing delayed >24hrs.
Stability: Ambient 1 day. Refrigerated 6 days. Frozen > 6 days
Testing Schedule Mon - Fri  
Expected TAT 1-2 Days  
Notes 7/6/2020 The T3 Total unit of measure has been changed from ng/mL to ng/dL.
CPT Code(s) 84481, 84480
Lab Section Chemistry