T3 Free


Sunquest Code:FT3  
Epic Code:LAB137Epic Name:T3 Free
Synonyms:Free T3; Triiodothyronine; FT3; Thyroid; TFT
Methodology:Chemiluminescence
CPT Code:84481
Turnaround Time:Performed and reported 24 hours/day.


Collection Instructions

Specimen:Blood
Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Red or gold (gel) (Green (lithium heparin, gel), Green (lithium heparin) on ICE, Green (sodium heparin, no gel), Green (sodium heparin, no gel) on ICE, Purple (EDTA), Red (no gel))
Causes for Rejection:Grossly hemolyzed.
Contraindications:Large doses of biotin (10 mg or more per day) may cause clinically significant interference in free T3 levels. If interference is suspected, it is strongly recommended that biotin is discontinued for at least one week prior to retesting.


Processing and Shipping

Specimen Processing:Separate serum or plasma from cells ASAP. Centrifuge and aliquot 1.25 mL, 0.2 mL minimum.
Shipping Instructions:Ship at refrigerated temperature.
Stability:Stability: Specimens are stable 1 week at refrigerated temperature.
Test Performed at or Referral Lab Chemistry  (UMMC-East Bank, Grand Itasca GICH)


Interpretive

Reference Range:Greater than 1 year: 2.3-4.2 pg/mL
GICH: All ages 2.5-3.9 pg/mL


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