Free Thyroxine Index (FT4I) 

 

METHODOLOGY

This is not a test per-se.  It is a calculated ratio of two tests: Total T4 / THBR

PERFORMED  

 

Tuesday & Friday

 

REPORTED  

2 days

 

REMARKS

FT4-Index Components: Thyroxine (T4), Thyroid Hormone Binding Ratio (THBR)

 

REFERENCE RANGE

 

4.5 – 12.5 (no units)

CPT CODES

84436 (T4), 84479 (THBR)