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

Test Code
T4


Preferred Specimen
LIGHT GREEN (LITHIUM) GEL OR GOLD TOP TUBE Tube


Specimen Stability
3 days


Clinical Significance
In vitro diagnostice test for the quantitative determination of total thyroxine in human plasma.  T4 is the principal hormone produced by the thyroid gland and along with T3 are primarily responsible for metabolism.  Thyroxine also plays a crucial role in heart and digestive function, brain development, bone health, and muscle control.




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.