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Test Code NFTI Free Thyroxine Index (FTI), Serum

Additional Codes

This test includes total T4 and T4 uptake

Specimen

Draw blood in plain red top tube or serum gel (gold) tube. 1.0 ml serum required.

 

 

Note:  Label specimen with patient’s name (first and last), date of birth, date and time of draw, and phlebotomist’s initials.

Performing Location

NORDX

CPT Code

84436  Thyroxine, total

84479  T4 uptake

Collection Container

Plain red or serum gel (gold top)

Specimen Transport Temperature

Refrigerated

Day(s) Test Set Up

Monday through Friday

Volume

1.0 ml

Units of Measure

ug/dL

LOINC

3026-2

Methodology

Electrochemiluminescence Immunoassay (ECLIA)