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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