T3 Free (FT3)
1 SST/1.0 mL serum. After 30 minutes of clotting, promptly centrifuge and refrigerate.
Room temp and Refrigerated: 7 days
1 day Set up Mon-Sat PM
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.