A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Thyroxine, Total

Message
Measurement of total thyroxine gives a reliable reflection of clinical thyroid status in the absence of binding abnormalities.


Test Code
TT4


Alias/See Also
LAB3001426
T4


CPT Codes
84436

Preferred Specimen
2.0 mL serum collected in a gold serum separator tube (SST)


Minimum Volume
0.5 mL serum


Other Acceptable Specimens
2.0 mL serum collected in an orange rapid clot serum separator tube (RCT)


Specimen Stability
Store centrifuged samples tightly stoppered at room temperature 15 - 30oC for no longer than eight hours.  If the assay will not be completed within eight hours, refrigerate the samples at 2 - 8oC.  If the assay will not be completed within 48 hours, or for shipment of samples, freeze serum at -20oC or colder.


Methodology
Immunoassay

Reference Range
Sex Age Reference Range
M/F 0 - 150 years 6.09 - 12.23 µg/dL


Performing Laboratory
Penn Medicine Lancaster General Health



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.