Test Code T4TOT T4 (Thyroxine), Total, Serum
Performing Laboratory
NorDx
Reference Values
Adult: 5.3-12.3 µg/dL
Pediatric:
Ages: 1-3 yrs: 6.8-13.5 µg/dL
Ages: 3-10 yrs: 5.5-12.8 µg/dL
Methodology
Electrochemiluminescence Immunoassay (ECLIA)
Specimen Requirements
Draw blood in a plain, red-top tube or serum gel tube. Spin down and send 1 mL (minimum volume: 0.5 mL) of serum refrigerated.
Note: Label specimen with patient’s name (first and last), date of birth, date and time of draw, and phlebotomist’s initials.
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
84436