Specimen Requirements

Title

T3 Free (FT3)

Specimen Requirement

1 SST/1.0 mL serum. After 30 minutes of clotting, promptly centrifuge and refrigerate.

Methodology

Stability

Room temp and Refrigerated: 7 days

Reference Range

By Report

Turnaround

1 day Set up Mon-Sat PM

Clinical Use

Used to evaluate thyroid function and binding protein status. In hyperthyroidism if TSH levels are low but the FT4 level is normal, a T3 measurement should be performed, since the serum T3 concentration is often elevated earlier in the course of hyperthyroidism and to a greater degree than the T4 concentration.

Test Code

FT3S