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HelpTest Code T4 THYROXINE
Performing Laboratory
Helen Keller Laboratory
Specimen Container:
Green Lithium Heparin Tube
Specimen Requirements
Preferred: Lithium heparin (light green-top)
Acceptable: Serum
Minimum volume: 1 mL (pediatric: 0.2 mL) of plasma or serum.
Specimen Stability Information
3 days refrigerated
Reference Intervals:
0 days - 6 days 4.7 – 13.3 UG/DL
7 days-27 days 9.8 – 16.6 UG/DL
28 days-4 months 7.2 – 14.4 UG/DL
4 months-1 year 7.8 – 16.5 UG/DL
1 year-5 years 7.3 – 15.0 UG/DL
10-16 years 5.6 – 11.7 UG/DL
>16 years 4.5 – 11.7 UG/DL
Day(s) Testing is Performed
Monday-Sunday
CPT Coding:
84436