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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