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Labcorp Oklahoma, Inc.
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Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry

Order Name T3 FREE SP
Test Number: 6905173
Revision Date 10/05/2022
Test Name Methodology LOINC Code
Triiodothyronine, Free by Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry
Quant Equilibrium Dialysis/HPLC-Tandem Mass Spectrometry  
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1 mL (0.3 mL) Serum Clot Activator SST Refrigerated or Frozen
Alternate 1 1 mL (0.3 mL) Plasma EDTA (Lavender Top) Refrigerated or Frozen
Alternate 2 1 mL (0.3 mL) Plasma Sodium Heparin (Green Top, No-Gel) Refrigerated or Frozen
Instructions Separate from cells ASAP or within 45 minutes of collection. Transfer 1mL(0.3mL) serum or plasma to a Standard Transport Tube.
Stability: Ambient: 5 days; Refrigerated: 5 days; Frozen: 10 weeks
This test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.
GENERAL INFORMATION
Testing Schedule Varies 
Expected TAT 8-14 days  
Notes Reference Lab: ARUP
Test Code: 2011793
Click Here to view information on the ARUP website.
CPT Code(s) 84481
Lab Section Reference Lab