T4 (Thyroxine),Total : 867

Test Code
T4CT or 867


Alias/See Also
THYROXINE * T4 * T4, TOTAL * TETRAIODOTHYRONINE * THYROXINE T4 * THYROXINE TOTAL


CPT Codes
84436

Preferred Specimen
1 mL serum


Minimum Volume
0.5 mL


Other Acceptable Specimens
Plasma collected in a sodium or lithium heparin (green-top) tube


Transport Temperature
Room temperature


Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days


Methodology
Immunoassay

Setup Schedule
Sunday - Saturday


Report Available
1 day


Reference Range
T4 (Thyroxine), Total 
                             Male (mcg/dL)     Female (mcg/dL) 
<1 Month          4.5-17.2                   4.5-17.2 
1-23 Months      5.9-13.9                   5.9-13.9 
2-12 Years         5.7-11.6                   5.7-11.6 
13-20 Years       5.1-10.3                  5.3-11.7 
>20 Years          4.9-10.5                  5.1-11.9 
   
       
 


Clinical Significance
For the diagnosis of hypothyroidism and hyperthyroidism. 


Performing Laboratory
med fusion



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.