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Free T4

Alternative Names:Free Thyroxine
Thyroxine; Free
T4; Free
Laboratory:Clinical Biochemistry
Test Code:FT4
Specimen Types:Serum
Plasma
Container Types:
SST
Lithium Heparin (with Gel)
Collection & Request Instructions:Retrospective testing within 7 days
Transport Instructions between Sites and/or Laboratories:Room Temperature
Additional Notes:

Method used is Abbott Alinity (CMIA).

FT4 Adult Reference Interval:  9.1—19.6 pmol/L

 

FT4 Paediatric Reference Intervals:

1-3 days                  12.0 - 36.0 pmol/L

4-7 days                  12.0 - 32.0 pmol/L

1 week - 2 weeks     11.0 - 28.0 pmol/L

2 weeks - 3 weeks   11.0 - 24.0 pmol/L

3 weeks - 6 year       11.0 - 20.0 pmol/L

> 6 years                  9.1 - 19.6 pmol/L

Paediatric Reference Intervals derived from AACB Harmonisation