Test Code T4 T4 (Thyroxine)
Performing Laboratory
ChristianaCare-Newark Campus
Methodology
Electrochemiluminescent Immunoassay
Specimen Requirements
Container/Tube: Preferred: 4.5 mL Lithium Heparin (Mint Green top PST Gel) tube
Acceptable: 5.0 mL SST (Gold top) tube or 6.0 mL Serum (Red top) tube
Specimen: Full tube
Collection Instructions:
Note: Label tube with patient’s full name and 1 additional unique patient identifier such as date of birth, medical record number, emergency ID number, date and time of draw, collector’s initials, and type of specimen.
Reference Values
4.6-12.0 mcg/dL
Day(s) Test Set Up
Monday through Sunday
Routine Turnaround Time: not available
STAT Turnaround Time: not available