T4 (Thyroxine),Total : 867

Test Code
T4CT or 867


CPT Codes
84436

Transport Container
Preferred Specimen
1 mL serum

Alternative Specimens
Plasma collected in: Sodium heparin (green-top) or lithium heparin (green-top) tube

Minimum Volume
0.5 mL


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 
   
       
Free T4 Index (T7)         1.4-3.8 


Clinical Significance
Useful for 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.