Resources

T4 (Thyroxine)

Test Code
T4


Alias/See Also
Performed at SQL, test code 8045


CPT Codes
84436

Preferred Specimen
 mL serum from a serum separator tube (SST) (0.5 mL min). Centrifuge as soon as possible after clot formation. Be sure barrier forms a complete separation between serum and cells. prefer within 45 minutes after collection.


Instructions
See link below for specimen details, methodology, setup schedule and reference ranges.


Transport Container
Serum Separator Tube


Transport Temperature
Refrigerated


Specimen Stability
Ambient: Information not available
Refrigerated: 7 Days
Frozen: 4 Weeks


Methodology
Electrochemilumiescent Immunoassay (ECLIA)

Setup Schedule
Setup Days, Evenings & Nights: Monday through Sunday Results available in 1 day.


Additional Information
Thyroxine (T4)


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.