Test Code T3F.1 TRIIODOTHYRONINE (T3) FREE
Methodology
Competitive Two-Step Chemiluminometric Immunoassay
Specimen Requirements
Submit only 1 of the following specimens:
Preferred:
Serum
Serum Gel Tube
Container/Tube: Serum gel tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of
serum
Collection Instructions: Spin down within 4 hours of draw.
Note: Label specimen appropriately (serum).
Alternate:
Serum
Plain, Red-Top Tube
Container/Tube:
Plain, red-top tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of
serum
Collection Instructions: Spin down within 4 hours of draw.
Note: Label specimen appropriately (serum).
Plasma
Container/Tube: Green-top (lithium heparin) tube(s)
Specimen Volume: 1 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Spin down within 4 hours of draw.
Note: Label specimen appropriately (plasma).
Day(s) Test Set Up
Monday through Friday
Reference Values
2.8-5.3 pg/mL
Performing Laboratory
Logan Health Medical Center-Chemistry
Test Classification and CPT Coding
84481
Specimen Transport Temperature
Refrigerate