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HelpTest Code FT4 T4 (Thyroxine), Free, Serum
Additional Codes
| Ordering Mnemonic |
|---|
| FT4 |
Methodology
Chemiluminescence
Performing Laboratory
Holland Hospital Laboratory Services
Specimen Requirements
Specimen must arrive within 48 hours of draw.
Serum
Container/Tube: Serum gel tube
Specimen Volume: 1 mL of serum
Collection Instructions: If there is a delay in transport of ≥48 hours, send specimen frozen in plastic vial.
Note: 1. Indicate serum.
2. Label specimen appropriately (serum).
Specimen Transport Temperature
Refrigerate; Freeze if >48 hours
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84439 (HH Bill Code 0205652)
Reference Values
0.78-2.19 ng/dL