T4, FreeMain Content
Test Code: 866
CPT Code(s): 84439
Clinical Significance: For diagnosis of hypothyroidism and hyperthyroidism
Additional names: Free T-4, Free Thyroxine, FT4, Thyroxine Free
Supply: T01 - Red/Gray SST 8.5mL
Preferred Specimen: Serum
Preferred Volume: 1mL
Transport Container: Serum Separator Tube (SST)
Transport Temperature: Room Temperature
Specimen Stability: Room Temperature: 7 Days
Reject due: unlabeled or improperly labeled specimens and specimens other than serum
For additional supply or collection device information, please contact DLO's Customer Service at (800) 891-2917, option 2.
The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.