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
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