T3 Free

Abbrev Code:FT3   
Order Code:LAB137Order Name:T3 Free
Synonyms:Free T3; Triiodothyronine; FT3; Thyroid; TFT
Methodology:Electrochemiluminescence immunoassay (ECLIA)
CPT Codes: 84481 x1, 84481 x1
Turnaround Time:Performed and reported 24 hours/day.

Collection Instructions

Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel)
Alternate Containers: Green (lithium heparin, no gel), Green (lithium heparin, gel) on ICE, Red (no gel), Red or gold (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:5 days at room temperature; 7 days refrigerated; 30 days frozen. Freeze only once.
Test Performed at or Referral Lab Chemistry  (Roche-UMMC East)


Reference Range:
Age pg/mL
0-30 d 2.0-5.2
1-12 mo 1.5-6.4
1-5 y 2.0-6.0
6-10 y 2.7-5.2
11-18 y 2.3-5.0
19 y & older 2.0-4.4

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