T4, FREE (THYROXINE) (FRT4)

Test Code
LAB127

Alias/See Also
FRT4

CPT Codes
84439

Preferred Specimen
1 mL plasma

Transport Container
Preferred: Gold top; Acceptable: Light green top, Plain red top

Transport Temperature
Refrigerated

Reference Range
0.93-1.70 ng/dL



The CPT Codes provided in this document 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. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.