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Test Code FRTUP T3 Uptake (Free Thyroxine Index(FTI), S)

Important Note

  • This test includes a Total T4, if the ordering MD has also ordered a T4, do not order the T4.

Additional Codes

FRTUP Profile Includes:

  • T3 Uptake
  • Thyroxine Binding Capacity-TBC
  • Thyroxine Binding Index-TBI

Methodology

Electrochemiluminescence Immunoassay

Specimen Requirements

Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Specimen Volume: 1 mL

Additional Information: 12 hours before this blood test do not take multivitamins or dietary supplements containing biotin or vitamin B7, which are commonly found in hair, skin, and nail supplements and multivitamins.

Day(s) Test Set Up

Monday through Sunday; Continuously

Test Classification and CPT Coding

84479-Thyroxine binding capacity(TUP)

84436-Thyroxine total (T4S)

Performing Laboratory

Mayo Medical Laboratories in Rochester

Aliases

T-Uptake
T4-Uptake
Thyroxine Binding Capacity-TBC
Thyroxine Binding Index-TBI