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FREE T4 THYROXINE

Message
 
PLEASE NOTE: SAMPLE TYPE CHANGE as of 10/23/2018
Gold SST or LG-RED (serum) preferred.
Mint Green (plasma) also acceptable for Free T4 (other thyroid tests require GOLD-SST).
 


Test Code
FT4


CPT Codes
84439

Preferred Specimen
PLASMA


Other Acceptable Specimens
SERUM


Transport Container
MINT


Transport Temperature
REF-2 DAYS


Setup Schedule
Set Up:
Report Available:


Reference Range
FREE T4 THYROXINEng/dL0Y 00M F 0.55-1.92 0Y 00M M 0.55-1.92 18 F 0.61-1.12 18 M 0.61-1.12


Clinical Significance
T4 circulates in the blood as equilibrium mixtures of free and protein-bound hormones. Changes in concentration or affinity of TBG or other transport proteins profoundly affect the total hormone concentration in serum. The free hormone is independent of these binding protein variations and remains almost constant
This test can be used to diagnose hyperthyroidism or hypothyroidism.


Performing Laboratory
LMH -  Chemistry  x3739 or 3764



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.